{"id":55816,"date":"2021-04-07T08:25:20","date_gmt":"2021-04-07T07:25:20","guid":{"rendered":"https:\/\/datascientest.com\/?p=55816"},"modified":"2023-11-09T14:09:35","modified_gmt":"2023-11-09T14:09:35","slug":"dendrogramme","status":"publish","type":"post","link":"https:\/\/datascientest.com\/dendrogramme","title":{"rendered":"Dendrogramme : tout sur le diagramme de clustering hi\u00e9rarchique"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"55816\" class=\"elementor elementor-55816\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-895010f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"895010f\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-4e1d6ba\" data-id=\"4e1d6ba\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-201bd92 elementor-widget elementor-widget-heading\" data-id=\"201bd92\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-heading-title{padding:0;margin:0;line-height:1}.elementor-widget-heading .elementor-heading-title[class*=elementor-size-]>a{color:inherit;font-size:inherit;line-height:inherit}.elementor-widget-heading .elementor-heading-title.elementor-size-small{font-size:15px}.elementor-widget-heading .elementor-heading-title.elementor-size-medium{font-size:19px}.elementor-widget-heading .elementor-heading-title.elementor-size-large{font-size:29px}.elementor-widget-heading .elementor-heading-title.elementor-size-xl{font-size:39px}.elementor-widget-heading .elementor-heading-title.elementor-size-xxl{font-size:59px}<\/style><h2 class=\"elementor-heading-title elementor-size-default\">Un Dendrogamme est un diagramme de regroupement hi\u00e9rarchique, permettant d'organiser des donn\u00e9es en arborescence en fonction de leurs similitudes. D\u00e9couvrez tout ce que vous devez savoir \u00e0 son sujet.<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-f206c92 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f206c92\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-8d57332\" data-id=\"8d57332\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-23f9221 elementor-widget elementor-widget-text-editor\" data-id=\"23f9221\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<p>La visualisation de donn\u00e9es est tr\u00e8s utile pour pr\u00e9senter les donn\u00e9es de fa\u00e7on lisible et pertinente. Il existe une large vari\u00e9t\u00e9 de techniques et <strong>d&rsquo;algorithmes pour organiser automatiquement les donn\u00e9es<\/strong> de diverses mani\u00e8res. L&rsquo;une de ces m\u00e9thodes est le regroupement hi\u00e9rarchique, reposant sur les diagrammes de type Dendrogramme.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-c215c56 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"c215c56\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-b90f975\" data-id=\"b90f975\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5089054 elementor-widget elementor-widget-heading\" data-id=\"5089054\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Qu'est-ce que le clustering hi\u00e9rarchique ?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-b555286 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b555286\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-5967e9f\" data-id=\"5967e9f\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9180d0b elementor-widget elementor-widget-text-editor\" data-id=\"9180d0b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Le clustering ou regroupement hi\u00e9rarchique consiste \u00e0 <strong>cr\u00e9er une arborescence de cluster <\/strong>pour repr\u00e9senter les donn\u00e9es. Au sein de cet arbre, chaque groupe ou \u00a0\u00bb noeud \u00a0\u00bb est li\u00e9 \u00e0 deux groupes successeurs ou davantage.<\/p><p>Les groupes sont imbriqu\u00e9s entre eux et <strong>organis\u00e9s sous la forme d&rsquo;un arbre<\/strong>. Chaque noeud de l&rsquo;arborescence contient un groupe de donn\u00e9es similaires, et les noeuds sont regroup\u00e9s en fonction de leurs similitudes.<\/p><p>Les <strong>groupes d&rsquo;un niveau rejoignent les groupes du niveau sup\u00e9rieur<\/strong>, toujours en fonction de leurs similitudes. Le processus se poursuit jusqu&rsquo;\u00e0 ce que tous les noeuds soient int\u00e9gr\u00e9s \u00e0 l&rsquo;arborescence.Le nombre total de clusters n&rsquo;est pas pr\u00e9d\u00e9termin\u00e9 avant la cr\u00e9ation du graphique.<\/p><p>Dans l&rsquo;id\u00e9al, le sch\u00e9ma final repr\u00e9sente une classification claire et lisible des donn\u00e9es. Ce<strong> regroupement hi\u00e9rarchique offre un \u00a0\u00bb snapshot \u00a0\u00bb visuel<\/strong> instantan\u00e9 de l&rsquo;ensemble de donn\u00e9es. Cette arborescence de clusters porte le nom de dendrogramme.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-c3a6442 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"c3a6442\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-218087e\" data-id=\"218087e\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-498bf7e elementor-widget elementor-widget-heading\" data-id=\"498bf7e\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Qu'est-ce qu'un dendrogramme ?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-62d092a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"62d092a\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-ffcbe9a\" data-id=\"ffcbe9a\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-45d9b6e elementor-widget elementor-widget-text-editor\" data-id=\"45d9b6e\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Le Dendrogramme est donc<strong> le type de diagramme en arborescence<\/strong> que l&rsquo;on utilise pour pr\u00e9senter le clustering hi\u00e9rarchique, \u00e0 savoir les relations entre des ensembles de donn\u00e9es similaires.<\/p><p>Ce type de graphique est couramment utilis\u00e9 dans le domaine de la biologie, notamment, pour pr\u00e9senter les liens entre des groupes de g\u00e8nes. Toutefois, il est possible de repr\u00e9senter n&rsquo;importe quel type de donn\u00e9es. C&rsquo;est la raison pour laquelle le Dendrogramme est <strong>un concept majeur de la Data Science<\/strong> et de la Data Visualization.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-dfebec9 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"dfebec9\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-9f28b67\" data-id=\"9f28b67\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7653f04 elementor-widget elementor-widget-image\" data-id=\"7653f04\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-widget-image{text-align:center}.elementor-widget-image a{display:inline-block}.elementor-widget-image a img[src$=\".svg\"]{width:48px}.elementor-widget-image img{vertical-align:middle;display:inline-block}<\/style>\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"235\" src=\"https:\/\/datascientest.com\/wp-content\/uploads\/2021\/03\/dendrogramme.jpg\" class=\"attachment-large size-large wp-image-55823\" alt=\"dendrogramme\" srcset=\"https:\/\/datascientest.com\/wp-content\/uploads\/2021\/03\/dendrogramme.jpg 1022w, https:\/\/datascientest.com\/wp-content\/uploads\/2021\/03\/dendrogramme-300x88.jpg 300w, https:\/\/datascientest.com\/wp-content\/uploads\/2021\/03\/dendrogramme-768x225.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Le dendrogramme<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-2fdf72b elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"2fdf72b\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-bc112be\" data-id=\"bc112be\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7742423 elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"7742423\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/datascientest.com\/formation-data-management\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Tout savoir sur le Dendrogramme et la DataViz<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-2a42ad1 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"2a42ad1\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-b41300b\" data-id=\"b41300b\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-505d5e9 elementor-widget elementor-widget-heading\" data-id=\"505d5e9\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Les diff\u00e9rentes parties d'un dendrogramme<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7fcbb5e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7fcbb5e\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-476584a\" data-id=\"476584a\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c0ec878 elementor-widget elementor-widget-text-editor\" data-id=\"c0ec878\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>On distingue <strong>diff\u00e9rentes formes de Dendrogrammes<\/strong>. Il peut s&rsquo;agir d&rsquo;un graphique en ligne, ou en colonne. Le diagramme a parfois aussi une forme circulaire, ou tout simplement une forme abstraite.<\/p><p>N\u00e9anmoins, les logiciels produisent g\u00e9n\u00e9ralement <strong>des graphiques en ligne ou en colonne<\/strong>. Quelle qu&rsquo;en soit la forme, un dendrogramme de base regroupe les m\u00eames composants.<\/p><p>Les<strong> clades sont les branches de l&rsquo;arbre<\/strong>. Le plus souvent, chaque clade est d\u00e9sign\u00e9 par une lettre de l&rsquo;alphabet grec dans un sens de lecture allant de la gauche vers la droite.<\/p><p>Chaque <strong>clade poss\u00e8de une ou plusieurs feuilles<\/strong>. Ces feuilles peuvent \u00eatre simples, doubles ou triples. La quantit\u00e9 de feuilles d&rsquo;un clade est th\u00e9oriquement illimit\u00e9e, mais le graphique devient plus difficile \u00e0 lire \u00e0 mesure que le nombre augmente.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3344721 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3344721\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-0318c11\" data-id=\"0318c11\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-bb3ed75 elementor-widget elementor-widget-heading\" data-id=\"bb3ed75\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Comment lire un Dendrogramme ?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-9b76411 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"9b76411\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-07dbbbc\" data-id=\"07dbbbc\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-f6d36d4 elementor-widget elementor-widget-text-editor\" data-id=\"f6d36d4\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Comme expliqu\u00e9 pr\u00e9c\u00e9demment, les clades d&rsquo;un Dendogramme sont <strong>organis\u00e9s en fonction de leurs similitudes<\/strong>. De fait, les clades align\u00e9s sur la m\u00eame hauteur sont similaires tandis que les clades de hauteurs diff\u00e9rentes sont diff\u00e9rents.<\/p><p>Plus la diff\u00e9rence de taille est importante, plus les clades sont diff\u00e9rents. Il existe<strong> diff\u00e9rentes m\u00e9thodes pour mesurer la similitude<\/strong>, est l&rsquo;une des plus populaires est le coefficient de corr\u00e9lation de Pearson.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-4b3138f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"4b3138f\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-3666080\" data-id=\"3666080\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6824830 elementor-widget elementor-widget-video\" data-id=\"6824830\" data-element_type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/youtu.be\\\/SE_4dLh5vXY&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-widget-video .elementor-widget-container{overflow:hidden;transform:translateZ(0)}.elementor-widget-video .elementor-wrapper{aspect-ratio:var(--video-aspect-ratio)}.elementor-widget-video .elementor-wrapper iframe,.elementor-widget-video .elementor-wrapper video{height:100%;width:100%;display:flex;border:none;background-color:#000}@supports not (aspect-ratio:1\/1){.elementor-widget-video .elementor-wrapper{position:relative;overflow:hidden;height:0;padding-bottom:calc(100% \/ var(--video-aspect-ratio))}.elementor-widget-video .elementor-wrapper iframe,.elementor-widget-video .elementor-wrapper video{position:absolute;top:0;right:0;bottom:0;left:0}}.elementor-widget-video .elementor-open-inline .elementor-custom-embed-image-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background-size:cover;background-position:50%}.elementor-widget-video .elementor-custom-embed-image-overlay{cursor:pointer;text-align:center}.elementor-widget-video .elementor-custom-embed-image-overlay:hover .elementor-custom-embed-play i{opacity:1}.elementor-widget-video .elementor-custom-embed-image-overlay img{display:block;width:100%;aspect-ratio:var(--video-aspect-ratio);-o-object-fit:cover;object-fit:cover;-o-object-position:center center;object-position:center center}@supports not (aspect-ratio:1\/1){.elementor-widget-video .elementor-custom-embed-image-overlay{position:relative;overflow:hidden;height:0;padding-bottom:calc(100% \/ var(--video-aspect-ratio))}.elementor-widget-video .elementor-custom-embed-image-overlay img{position:absolute;top:0;right:0;bottom:0;left:0}}.elementor-widget-video .e-hosted-video .elementor-video{-o-object-fit:cover;object-fit:cover}.e-con-inner>.elementor-widget-video,.e-con>.elementor-widget-video{width:var(--container-widget-width);--flex-grow:var(--container-widget-flex-grow)}<\/style>\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-a7bd49a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a7bd49a\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-0b998a7\" data-id=\"0b998a7\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7919414 elementor-widget elementor-widget-heading\" data-id=\"7919414\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Les algorithmes de regroupement hi\u00e9rarchique<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-24ed553 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"24ed553\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-656a799\" data-id=\"656a799\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9ee3904 elementor-widget elementor-widget-text-editor\" data-id=\"9ee3904\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Tous<strong> les algorithmes de regroupement hi\u00e9rarchique sont \u00a0\u00bb monotones \u00ab\u00a0<\/strong>. Cela signifie qu&rsquo;ils augmentent ou diminuent. Ils peuvent aller de bas en haut ou de haut en bas.<\/p><p>Si l&rsquo;algorithme va de bas en haut, il s&rsquo;agit d&rsquo;un d&rsquo;un <strong>algorithme HAC : Hierachical Agglomerative Clustering<\/strong> ou regroupement hi\u00e9rarchique agglom\u00e9ratif. Cet algorithme traite d&rsquo;abord chaque document comme un cluster unique, puis combine les \u00e9l\u00e9ments deux par deux pour former de nouveaux clusters.<\/p><p>La mani\u00e8re dont les paires sont combin\u00e9es d\u00e9pend d&rsquo;un <strong>calcul de diff\u00e9rence entre chaque paire combin\u00e9e<\/strong> et les autres \u00e9chantillons. Il existe diff\u00e9rentes m\u00e9thodes de calcul de cette diff\u00e9rence.<\/p><p>Le <strong>lien complet<\/strong> consiste \u00e0 mesurer la similitude avec la paire la plus \u00e9loign\u00e9e, mais cette m\u00e9thode pr\u00e9sente un risque de fusion entre des groupes proches trop tardive pour \u00eatre optimale.<\/p><p>Une autre m\u00e9thode est celle du <strong>lien unique ou single-linkage<\/strong>. Elle consiste \u00e0 mesurer la similitude avec la paire la plus proche. L\u00e0 encore, l&rsquo;inconv\u00e9nient est un risque de fusion pr\u00e9matur\u00e9e entre des groupes de paires proches malgr\u00e9 leurs diff\u00e9rences.<\/p><p>La<strong> m\u00e9thode de la moyenne du groupe<\/strong>, ou group average, mesure la similitude entre les groupes. Enfin, la similitude du centre de gravit\u00e9, ou \u00a0\u00bb centroid similarity \u00ab\u00a0, consiste \u00e0 fusionner les clusters avec le point central le plus similaire \u00e0 chaque it\u00e9ration.<\/p><p>Quelle que soit la m\u00e9thode,<strong> ce processus d&rsquo;appairage se poursuit<\/strong> jusqu&rsquo;\u00e0 ce que tous les \u00e9l\u00e9ments soient fusionn\u00e9s en un seul cluster. Le HAC est l&rsquo;algorithme de clustering hi\u00e9rarchique le plus utilis\u00e9. Toutefois, il pr\u00e9sente l&rsquo;inconv\u00e9nient de n\u00e9cessiter une puissance de calcul et une capacit\u00e9 de stockage colossales. Tout particuli\u00e8rement pour le Big Data.<\/p><p>En effet, \u00e0 titre de comparaison, ces algorithmes tr\u00e8s complexes repr\u00e9sentent <strong>quatre fois la taille d&rsquo;un algorithme de K-moyennes<\/strong>. Un autre d\u00e9faut est que la fusion entre les groupes est irr\u00e9versible. Ceci peut poser probl\u00e8me pour des donn\u00e9es bruyantes ou de haute dimension.<\/p><p>Si l&rsquo;algorithme va de haut en bas, il s&rsquo;agit d&rsquo;un <strong>algorithme de type divise clustering<\/strong> ou regroupement par division. Dans ce cas de figure, les donn\u00e9es sont d&rsquo;abord trait\u00e9es comme un cluster combin\u00e9.<\/p><p>Il se divise ensuite en <strong>deux parties distinctes, en fonction des similitudes<\/strong>. Chaque cluster se divise ensuite \u00e0 nouveau en deux, et ainsi de suite jusqu&rsquo;\u00e0 ce que chaque groupe ne contienne qu&rsquo;un seul point de donn\u00e9es.<\/p><p>Il s&rsquo;agit donc du<strong> fonctionnement inverse aux algorithmes HAC<\/strong>. Toutefois, le clustering par division est tr\u00e8s rarement utilis\u00e9.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6c0dfbe elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6c0dfbe\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-97640fe\" data-id=\"97640fe\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-26b880c elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"26b880c\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/datascientest.com\/formation-data-analyst\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Commencer une formation Data Analyst \/ DataViz<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-c184010 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"c184010\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-d81089a\" data-id=\"d81089a\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-958ea25 elementor-widget elementor-widget-heading\" data-id=\"958ea25\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Quels sont les inconv\u00e9nients du Dendrogramme ?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-28be2cf elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"28be2cf\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-0c6f724\" data-id=\"0c6f724\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6de67c4 elementor-widget elementor-widget-text-editor\" data-id=\"6de67c4\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Le regroupement hi\u00e9rarchique est pratique, mais peut facilement r\u00e9sulter sur<strong> des Dendrogrammes totalement erron\u00e9s<\/strong>. Pour cause, l&rsquo;algorithme de clustering s&rsquo;ex\u00e9cutera m\u00eame sur des donn\u00e9es totalement inadapt\u00e9es.<\/p><p>Une autre raison est que la m\u00e9thode de cr\u00e9ation de clusters choisie peut g\u00e9n\u00e9rer des Dendrogrammes tr\u00e8s diff\u00e9rents. Il est tr\u00e8s <strong>important de choisir la bonne m\u00e9thode<\/strong>, mais ce n&rsquo;est pas toujours \u00e9vident.<\/p><p>La seule fa\u00e7on d&rsquo;\u00e9viter \u00e0 coup s\u00fbr ce d\u00e9sagr\u00e9ment est de <strong>conna\u00eetre pr\u00e9cis\u00e9ment toutes les donn\u00e9es du dataset<\/strong>. Dans le cas du Big Data, c&rsquo;est quasiment impossible.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-1c575ed elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"1c575ed\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-dde078b\" data-id=\"dde078b\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-17435da elementor-widget elementor-widget-heading\" data-id=\"17435da\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Comment apprendre \u00e0 utiliser le Dendrogramme ?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-c3bcac3 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"c3bcac3\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-5c235aa\" data-id=\"5c235aa\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7b9a9f1 elementor-widget elementor-widget-video\" data-id=\"7b9a9f1\" data-element_type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/www.youtube.com\\\/watch?v=SNNK6z03TaA&amp;t=57s&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-0bbcc47 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"0bbcc47\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-da65678\" data-id=\"da65678\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-108c53c elementor-widget elementor-widget-text-editor\" data-id=\"108c53c\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Le Dendrogramme n&rsquo;est qu&rsquo;un type de diagramme parmi tant d&rsquo;autres dans le domaine de la visualisation de donn\u00e9es. Pour apprendre \u00e0 utiliser toutes les techniques de DataViz, vous pouvez vous tourner vers <a href=\"https:\/\/datascientest.com\/formations-data\" target=\"_blank\" rel=\"noopener\">les formations DataScientest<\/a>.<\/p><p>La <strong>Data Visualization est au programme<\/strong> de nos parcours Data Analyst, Data Scientist et Data Management. Ces diff\u00e9rents cursus vous permettront d&rsquo;acqu\u00e9rir toutes les comp\u00e9tences requises pour travailler dans la Data Science, telles que la programmation en Python, la manipulation de bases de donn\u00e9es <a href=\"https:\/\/datascientest.com\/machine-learning-tout-savoir\" target=\"_blank\" rel=\"noopener\">ou le Machine Learning<\/a>.<\/p><p>Toutefois nos formations peuvent \u00eatre effectu\u00e9es <strong>en BootCamp ou en formation continue<\/strong>. Elles adoptent par ailleurs une approche innovante de \u00a0\u00bb blended learning \u00a0\u00bb mariant pr\u00e9sentiel et distanciel pour offrir le meilleur des deux mondes.<\/p><p>Ces parcours peuvent \u00eatre financ\u00e9s par <strong>le Compte Personnel de Formation<\/strong>, ou par P\u00f4le Emploi via l&rsquo;AIF. \u00c0 l&rsquo;issue du programme, les apprenants re\u00e7oivent <strong>un dipl\u00f4me certifi\u00e9 par l&rsquo;Universit\u00e9 de la Sorbonne<\/strong> et 93% de nos alumnis ont trouv\u00e9 un emploi imm\u00e9diatement. Ne perdez plus une seconde, et d\u00e9couvrez nos formations !<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-597111b elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"597111b\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-b95f69c\" data-id=\"b95f69c\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-0554fec elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"0554fec\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/datascientest.com\/formation-data-scientist\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">D\u00e9couvrir la formation Data Scientist<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e0b9aa4 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e0b9aa4\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-f13cb74\" data-id=\"f13cb74\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-f02737a elementor-widget elementor-widget-text-editor\" data-id=\"f02737a\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Vous savez tout sur le Dendrogramme. D\u00e9couvrez <a href=\"https:\/\/datascientest.com\/quest-ce-la-dataviz-le-point-avec-nos-data-experts\" target=\"_blank\" rel=\"noopener\">notre dossier complet sur la DataViz<\/a>, et notre introduction <a href=\"https:\/\/datascientest.com\/python-tout-savoir\" target=\"_blank\" rel=\"noopener\">au langage de programmation Python<\/a>.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-00f1fe3 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"00f1fe3\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-585d5ab\" data-id=\"585d5ab\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-cf4f920 elementor-widget elementor-widget-html\" data-id=\"cf4f920\" data-element_type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"FAQPage\",\r\n  \"mainEntity\": [{\r\n    \"@type\": \"Question\",\r\n    \"name\": \"Qu'est-ce que le clustering hi\u00e9rarchique ?\",\r\n    \"acceptedAnswer\": {\r\n      \"@type\": \"Answer\",\r\n      \"text\": \"Le clustering ou regroupement hi\u00e9rarchique consiste \u00e0 cr\u00e9er une arborescence de cluster pour repr\u00e9senter les donn\u00e9es. Au sein de cet arbre, chaque groupe ou \\\" noeud \\\" est li\u00e9 \u00e0 deux groupes successeurs ou davantage.\"\r\n    }\r\n  },{\r\n    \"@type\": \"Question\",\r\n    \"name\": \"Qu'est-ce qu'un dendrogramme ?\",\r\n    \"acceptedAnswer\": {\r\n      \"@type\": \"Answer\",\r\n      \"text\": \"Le Dendrogramme est donc le type de diagramme en arborescence que l'on utilise pour pr\u00e9senter le clustering hi\u00e9rarchique, \u00e0 savoir les relations entre des ensembles de donn\u00e9es similaires.\"\r\n    }\r\n  },{\r\n    \"@type\": \"Question\",\r\n    \"name\": \"Les diff\u00e9rentes parties d'un dendrogramme\",\r\n    \"acceptedAnswer\": {\r\n      \"@type\": \"Answer\",\r\n      \"text\": \"On distingue diff\u00e9rentes formes de Dendrogrammes. Il peut s'agir d'un graphique en ligne, ou en colonne. Le diagramme a parfois aussi une forme circulaire, ou tout simplement une forme abstraite.\"\r\n    }\r\n  },{\r\n    \"@type\": \"Question\",\r\n    \"name\": \"Comment lire un Dendrogramme ?\",\r\n    \"acceptedAnswer\": {\r\n      \"@type\": \"Answer\",\r\n      \"text\": \"Comme expliqu\u00e9 pr\u00e9c\u00e9demment, les clades d'un Dendogramme sont organis\u00e9s en fonction de leurs similitudes. De fait, les clades align\u00e9s sur la m\u00eame hauteur sont similaires tandis que les clades de hauteurs diff\u00e9rentes sont diff\u00e9rents.\"\r\n    }\r\n  },{\r\n    \"@type\": \"Question\",\r\n    \"name\": \"Quels sont les inconv\u00e9nients du Dendrogramme ?\",\r\n    \"acceptedAnswer\": {\r\n      \"@type\": \"Answer\",\r\n      \"text\": \"Le regroupement hi\u00e9rarchique est pratique, mais peut facilement r\u00e9sulter sur des Dendrogrammes totalement erron\u00e9s. Pour cause, l'algorithme de clustering s'ex\u00e9cutera m\u00eame sur des donn\u00e9es totalement inadapt\u00e9es.\"\r\n    }\r\n  }]\r\n}\r\n<\/script>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Un Dendrogamme est un diagramme de regroupement hi\u00e9rarchique, permettant d&rsquo;organiser des donn\u00e9es en arborescence en fonction de leurs similitudes. D\u00e9couvrez tout ce que vous devez savoir \u00e0 son sujet. La visualisation de donn\u00e9es est tr\u00e8s utile pour pr\u00e9senter les donn\u00e9es de fa\u00e7on lisible et pertinente. Il existe une large vari\u00e9t\u00e9 de techniques et d&rsquo;algorithmes pour [&hellip;]<\/p>\n","protected":false},"author":77,"featured_media":55818,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_theme","format":"standard","meta":{"content-type":"","inline_featured_image":false},"categories":[2497],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.7 (Yoast SEO v21.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Dendrogramme : tout sur le diagramme de clustering hi\u00e9rarchique<\/title>\n<meta name=\"description\" content=\"Le dendrogramme est un diagramme de clustering ou regroupement hi\u00e9rarchique, tr\u00e8s utilis\u00e9 dans la Data Visualisation. D\u00e9couvrez son principe et son utilisation.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/datascientest.com\/dendrogramme\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dendrogramme : tout sur le diagramme de clustering hi\u00e9rarchique\" \/>\n<meta property=\"og:url\" content=\"https:\/\/datascientest.com\/dendrogramme\" \/>\n<meta property=\"og:site_name\" content=\"Formation Data Science | DataScientest.com\" \/>\n<meta property=\"article:published_time\" content=\"2021-04-07T07:25:20+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-11-09T14:09:35+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/datascientest.com\/wp-content\/uploads\/2021\/03\/dendrogramme-tout-savoir-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1386\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Raphael Kassel\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Raphael Kassel\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/datascientest.com\/dendrogramme\",\"url\":\"https:\/\/datascientest.com\/dendrogramme\",\"name\":\"Dendrogramme : tout sur le diagramme de clustering hi\u00e9rarchique\",\"isPartOf\":{\"@id\":\"https:\/\/datascientest.com\/#website\"},\"datePublished\":\"2021-04-07T07:25:20+00:00\",\"dateModified\":\"2023-11-09T14:09:35+00:00\",\"author\":{\"@id\":\"https:\/\/datascientest.com\/#\/schema\/person\/6eca16f63daaafcbc96e15549b9d4ee1\"},\"description\":\"Le dendrogramme est un diagramme de clustering ou regroupement hi\u00e9rarchique, tr\u00e8s utilis\u00e9 dans la Data Visualisation. 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