{"id":13246,"date":"2020-11-04T08:52:07","date_gmt":"2020-11-04T08:52:07","guid":{"rendered":"https:\/\/datascientest.com\/?p=13246"},"modified":"2023-11-09T14:11:38","modified_gmt":"2023-11-09T14:11:38","slug":"regression-logistique-quest-ce-que-cest","status":"publish","type":"post","link":"https:\/\/datascientest.com\/regression-logistique-quest-ce-que-cest","title":{"rendered":"La r\u00e9gression logistique, qu\u2019est-ce que c\u2019est ?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"13246\" class=\"elementor elementor-13246\" 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-d86ee0a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"d86ee0a\" 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-d287553\" data-id=\"d287553\" 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-6f705b5 elementor-widget elementor-widget-heading\" data-id=\"6f705b5\" 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\">Si vous vous int\u00e9ressez un tant soit peu au Machine Learning et aux probl\u00e8mes de classification, vous avez d\u00e9j\u00e0 d\u00fb\u00a0 avoir affaire au mod\u00e8le de r\u00e9gression logistique. Et pour cause ! Il s\u2019agit d\u2019un des mod\u00e8les de Machine Learning les plus simples et interpr\u00e9tables qui existe, prend des donn\u00e9es \u00e0 la fois continues ou discr\u00e8tes, et les r\u00e9sultats obtenus avec sont loin d\u2019\u00eatre risibles.\u00a0\nMais que se cache-t\u2019il derri\u00e8re cette m\u00e9thode miracle\u00a0? Et surtout comment l\u2019utiliser sur Python ? La r\u00e9ponse dans cet article<\/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-54d8b92 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"54d8b92\" 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-3743641\" data-id=\"3743641\" 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-4e0065d elementor-widget elementor-widget-heading\" data-id=\"4e0065d\" 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 la r\u00e9gression logistique ?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-016b874 elementor-widget elementor-widget-text-editor\" data-id=\"016b874\" 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><span style=\"font-weight: 400;\">La r\u00e9gression logistique est un <\/span><b>mod\u00e8le statistique<\/b><span style=\"font-weight: 400;\"> permettant d\u2019\u00e9tudier les relations entre un ensemble de <\/span><b>variables qualitatives X<\/b><span style=\"font-weight: 400;\">i<\/span><span style=\"font-weight: 400;\"> et une<\/span><b> variable qualitative Y<\/b><span style=\"font-weight: 400;\">. Il s\u2019agit d\u2019un <\/span><b>mod\u00e8le lin\u00e9aire<\/b><span style=\"font-weight: 400;\"> g\u00e9n\u00e9ralis\u00e9 utilisant une <\/span><b>fonction logistique<\/b><span style=\"font-weight: 400;\"> comme fonction de lien.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">Un mod\u00e8le de r\u00e9gression logistique permet aussi de <\/span><b>pr\u00e9dire la probabilit\u00e9 <\/b><span style=\"font-weight: 400;\">qu\u2019un \u00e9v\u00e9nement arrive (valeur de 1) ou non (valeur de 0) \u00e0 partir de l\u2019<\/span><b>optimisation des coefficients de r\u00e9gression<\/b><span style=\"font-weight: 400;\">. Ce r\u00e9sultat varie toujours entre 0 et 1. Lorsque la valeur pr\u00e9dite est sup\u00e9rieure \u00e0 un seuil, l\u2019\u00e9v\u00e9nement est susceptible de se produire, alors que lorsque cette valeur est inf\u00e9rieure au m\u00eame seuil, il ne l\u2019est pas.<\/span><\/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-9a20dda elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"9a20dda\" 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-a193b6c\" data-id=\"a193b6c\" 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-5419e6a elementor-widget elementor-widget-heading\" data-id=\"5419e6a\" 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\">Math\u00e9matiquement, comment \u00e7a se traduit \/ \u00e7a s'\u00e9crit ?<\/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-de329e8 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"de329e8\" 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-6e4c7e8\" data-id=\"6e4c7e8\" 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-3ad08e4 elementor-widget elementor-widget-text-editor\" data-id=\"3ad08e4\" 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><span style=\"font-weight: 400;\">Consid\u00e9rons une entr\u00e9e <\/span><span style=\"font-weight: 400;\">\u00a0<\/span><span style=\"font-weight: 400;\">X= <\/span><span style=\"font-weight: 400;\">x<\/span><span style=\"font-weight: 400;\">1<\/span> <span style=\"font-weight: 400;\">x<\/span><span style=\"font-weight: 400;\">2<\/span> <span style=\"font-weight: 400;\">x<\/span><span style=\"font-weight: 400;\">3<\/span> <span style=\"font-weight: 400;\">\u2026 <\/span><span style=\"font-weight: 400;\">\u00a0<\/span><span style=\"font-weight: 400;\">x<\/span><span style=\"font-weight: 400;\">n<\/span> <span style=\"font-weight: 400;\">, la r\u00e9gression logistique a pour objectif de trouver une fonction <\/span><span style=\"font-weight: 400;\">h<\/span><span style=\"font-weight: 400;\"> telle que nous puissions calculer\u00a0:<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b4ed0f6 elementor-widget elementor-widget-text-editor\" data-id=\"b4ed0f6\" 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 style=\"text-align: center;\">y= {1 \u00a0 si \u00a0\u00a0hX\u2265 seuil ,\u00a0\u00a00 \u00a0 si\u00a0\u00a0 hX&lt; seuil}\u00a0<\/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-8316e27 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"8316e27\" 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-05f40b0\" data-id=\"05f40b0\" 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-6c2274e elementor-widget elementor-widget-text-editor\" data-id=\"6c2274e\" 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><span style=\"color: #000000;\"><span style=\"font-weight: 400;\">On comprend donc qu\u2019on attend de notre fonction <\/span><span style=\"font-weight: 400;\">h<\/span><span style=\"font-weight: 400;\"> qu\u2019elle soit une probabilit\u00e9 comprise entre 0 et 1, param\u00e9tr\u00e9e par <\/span><span style=\"font-weight: 400;\">=<\/span><span style=\"font-weight: 400;\">1<\/span> <span style=\"font-weight: 400;\">2<\/span> <span style=\"font-weight: 400;\">3<\/span> <span style=\"font-weight: 400;\">n<\/span> <\/span><span style=\"font-weight: 400;\"><span style=\"color: #000000;\"> \u00e0 optimiser, et que le seuil que nous d\u00e9finissons correspond \u00e0 notre crit\u00e8re de classification, g\u00e9n\u00e9ralement il est pris comme valant 0.5.<\/span> <\/span><\/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-371c1b9 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"371c1b9\" 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-8a88234\" data-id=\"8a88234\" 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-aaa07a9 elementor-widget elementor-widget-text-editor\" data-id=\"aaa07a9\" 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><span style=\"font-weight: 400;\">La fonction qui remplit le mieux ces conditions est la fonction <\/span><b>sigmo\u00efde<\/b><span style=\"font-weight: 400;\">, d\u00e9finie sur <\/span><span style=\"font-weight: 400;\">R<\/span><span style=\"font-weight: 400;\"> \u00e0 valeurs dans [0,1]. Elle s\u2019\u00e9crit de la mani\u00e8re suivante\u00a0:<\/span><\/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-de61c60 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"de61c60\" 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-1c8411e\" data-id=\"1c8411e\" 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-4130a81 elementor-widget elementor-widget-image\" data-id=\"4130a81\" 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\t\t\t<img decoding=\"async\" width=\"114\" height=\"37\" src=\"https:\/\/datascientest.com\/wp-content\/uploads\/2020\/10\/capture-articl.png\" class=\"attachment-large size-large wp-image-13612\" alt=\"\" \/>\t\t\t\t\t\t\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-94af40d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"94af40d\" 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-0d0ab27\" data-id=\"0d0ab27\" 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-3dadbaf elementor-widget elementor-widget-text-editor\" data-id=\"3dadbaf\" 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>Graphiquement, celle-ci correspond \u00e0\u00a0<b>une courbe en forme de S<\/b>\u00a0qui a pour limites 0 et 1 lorsque x tend respectivement vers -\u221e\u00a0et +\u221e\u00a0passant par y = 0.5 en x = 0.<\/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-cae5c10 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"cae5c10\" 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-fa15c59\" data-id=\"fa15c59\" 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-37a3baa elementor-widget elementor-widget-image\" data-id=\"37a3baa\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\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=\"776\" height=\"555\" src=\"https:\/\/datascientest.com\/wp-content\/uploads\/2020\/10\/image1.png\" class=\"attachment-large size-large wp-image-13258\" alt=\"fonction sigmoid\" srcset=\"https:\/\/datascientest.com\/wp-content\/uploads\/2020\/10\/image1.png 776w, https:\/\/datascientest.com\/wp-content\/uploads\/2020\/10\/image1-300x215.png 300w, https:\/\/datascientest.com\/wp-content\/uploads\/2020\/10\/image1-768x549.png 768w\" sizes=\"(max-width: 776px) 100vw, 776px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Sigmoid function<\/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-f3f6306 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f3f6306\" 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-b4dce98\" data-id=\"b4dce98\" 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-0c396f0 elementor-widget elementor-widget-heading\" data-id=\"0c396f0\" 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\">Et notre classification dans tout \u00e7a ?<\/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-e913881 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e913881\" 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-18ad4ca\" data-id=\"18ad4ca\" 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-8eccae6 elementor-widget elementor-widget-text-editor\" data-id=\"8eccae6\" 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><span style=\"color: #000000;\"><span style=\"font-weight: 400;\">La fonction <\/span><span style=\"font-weight: 400;\">h<\/span><span style=\"font-weight: 400;\"> qui d\u00e9finit la r\u00e9gression logistique s\u2019\u00e9crit alors :<\/span><\/span><\/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-3564e4e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3564e4e\" 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-98c8012\" data-id=\"98c8012\" 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-ed5462b elementor-widget elementor-widget-image\" data-id=\"ed5462b\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"252\" height=\"154\" src=\"https:\/\/datascientest.com\/wp-content\/uploads\/2020\/10\/Capture-article-2.png\" class=\"attachment-large size-large wp-image-13613\" alt=\"\" \/>\t\t\t\t\t\t\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-c085ca8 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"c085ca8\" 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-9d7508b\" data-id=\"9d7508b\" 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-d2daaf0 elementor-widget elementor-widget-text-editor\" data-id=\"d2daaf0\" 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><span style=\"font-weight: 400;\">Tout le <\/span><b>probl\u00e8me de classification <\/b><span style=\"font-weight: 400;\">par r\u00e9gression logistique appara\u00eet alors comme un simple probl\u00e8me d\u2019optimisation o\u00f9, \u00e0 partir de donn\u00e9es, nous essayons d\u2019<\/span><b>obtenir le meilleur jeu de param\u00e8tre <\/b><b>\u0398<\/b> <span style=\"font-weight: 400;\">permettant \u00e0 notre courbe sigmo\u00efde de <\/span><b>coller au mieux aux donn\u00e9es<\/b><span style=\"font-weight: 400;\">. C\u2019est dans cette \u00e9tape qu\u2019intervient notre <\/span><b>apprentissage automatique<\/b><span style=\"font-weight: 400;\">.<\/span><\/p><p><span style=\"font-weight: 400;\">Une fois cette \u00e9tape effectu\u00e9e, voici un aper\u00e7u du r\u00e9sultat qu\u2019on peut obtenir:<\/span><\/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-c7502c5 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"c7502c5\" 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-e820097\" data-id=\"e820097\" 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-a114cb1 elementor-widget elementor-widget-image\" data-id=\"a114cb1\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"512\" height=\"297\" src=\"https:\/\/datascientest.com\/wp-content\/uploads\/2020\/10\/unnamed-4.png\" class=\"attachment-large size-large wp-image-13307\" alt=\"\" srcset=\"https:\/\/datascientest.com\/wp-content\/uploads\/2020\/10\/unnamed-4.png 512w, https:\/\/datascientest.com\/wp-content\/uploads\/2020\/10\/unnamed-4-300x174.png 300w\" sizes=\"(max-width: 512px) 100vw, 512px\" \/>\t\t\t\t\t\t\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-341d9af elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"341d9af\" 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-fa6de42\" data-id=\"fa6de42\" 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-8e7e74f elementor-widget elementor-widget-text-editor\" data-id=\"8e7e74f\" 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><span style=\"font-weight: 400;\">Il ne reste plus, \u00e0 partir du <\/span><b>seuil d\u00e9fini<\/b><span style=\"font-weight: 400;\">, qu\u2019\u00e0 classer les points en fonction de leurs positions par rapport \u00e0 la r\u00e9gression\u00a0et notre classification est faite\u00a0!\u00a0<\/span><\/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-982cea6 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"982cea6\" 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-3a1ff88\" data-id=\"3a1ff88\" 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-0c0fcf3 elementor-widget elementor-widget-heading\" data-id=\"0c0fcf3\" 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\">La r\u00e9gression logistique en pratique<\/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-9ec9617 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"9ec9617\" 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-b49d81c\" data-id=\"b49d81c\" 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-8ab267f elementor-widget elementor-widget-text-editor\" data-id=\"8ab267f\" 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><span style=\"font-weight: 400;\">En <a href=\"https:\/\/datascientest.com\/python-tout-savoir\">Python<\/a> c\u2019est assez simple, on se sert de la <\/span><b>classe LogisticRegression<\/b><span style=\"font-weight: 400;\"> du <\/span><b>module sklearn.linear_model <\/b><span style=\"font-weight: 400;\">comme un classificateur normal et que l\u2019on entra\u00eene sur des donn\u00e9es d\u00e9j\u00e0 nettoy\u00e9es et s\u00e9par\u00e9es en ensembles d&rsquo;entra\u00eenement et de test puis le tour est jou\u00e9\u00a0!\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">Niveau code, rien de plus basique\u00a0:\u00a0<\/span><\/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-92060d7 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"92060d7\" 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-3ae71d9\" data-id=\"3ae71d9\" 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-7366baf elementor-widget elementor-widget-shortcode\" data-id=\"7366baf\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/AdrienRuimy\/515a6e87f97167080cf5905a52f524a1.js\"><\/script><\/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-e996745 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e996745\" 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-64a7980\" data-id=\"64a7980\" 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-c435f3b elementor-widget elementor-widget-text-editor\" data-id=\"c435f3b\" 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><span style=\"font-weight: 400;\"><span style=\"color: #000000;\">Pour des cas d\u2019applications plus pouss\u00e9s, pourquoi ne pas suivre le cours dispens\u00e9 par l\u2019\u00e9quipe Datascientest ?\u00a0<\/span><\/span><\/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-b9e13b4 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b9e13b4\" 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-30a8d0b\" data-id=\"30a8d0b\" 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-a9e4f01 elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"a9e4f01\" 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=\"\/formations-data\">\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 nos formations<\/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<div class=\"elementor-element elementor-element-91d1460 e-flex e-con-boxed e-con\" data-id=\"91d1460\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ae3903c elementor-widget elementor-widget-html\" data-id=\"ae3903c\" 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\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": {\n    \"@type\": \"Question\",\n    \"name\": \"Qu'est-ce que la r\u00e9gression logistique ?\",\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"La r\u00e9gression logistique est un mod\u00e8le statistique permettant d\u2019\u00e9tudier les relations entre un ensemble de variables qualitatives Xi et une variable qualitative Y. Il s\u2019agit d\u2019un mod\u00e8le lin\u00e9aire g\u00e9n\u00e9ralis\u00e9 utilisant une fonction logistique comme fonction de lien.\"\n    }\n  }\n}\n<\/script>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Si vous vous int\u00e9ressez un tant soit peu au Machine Learning et aux probl\u00e8mes de classification, vous avez d\u00e9j\u00e0 d\u00fb&nbsp; avoir affaire au mod\u00e8le de r\u00e9gression logistique. Et pour cause ! Il s\u2019agit d\u2019un des mod\u00e8les de Machine Learning les plus simples et interpr\u00e9tables qui existe, prend des donn\u00e9es \u00e0 la fois continues ou discr\u00e8tes, [&hellip;]<\/p>\n","protected":false},"author":78,"featured_media":15728,"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>La r\u00e9gression logistique, qu\u2019est-ce que c\u2019est ?<\/title>\n<meta name=\"description\" content=\"SI vous connaissez le Machine Learning vous avez surement entendu parler du mod\u00e8de de la r\u00e9gression logistique. Definition dans cet article !\" \/>\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\/regression-logistique-quest-ce-que-cest\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La r\u00e9gression logistique, qu\u2019est-ce que c\u2019est ?\" \/>\n<meta property=\"og:url\" content=\"https:\/\/datascientest.com\/regression-logistique-quest-ce-que-cest\" \/>\n<meta property=\"og:site_name\" content=\"Formation Data Science | DataScientest.com\" \/>\n<meta property=\"article:published_time\" content=\"2020-11-04T08:52:07+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-11-09T14:11:38+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/datascientest.com\/wp-content\/uploads\/2020\/11\/illu_regression_blog-16.png\" \/>\n\t<meta property=\"og:image:width\" content=\"4268\" \/>\n\t<meta property=\"og:image:height\" content=\"2342\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"J\u00e9r\u00e9my Robert\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"J\u00e9r\u00e9my Robert\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/datascientest.com\/regression-logistique-quest-ce-que-cest\",\"url\":\"https:\/\/datascientest.com\/regression-logistique-quest-ce-que-cest\",\"name\":\"La r\u00e9gression logistique, qu\u2019est-ce que c\u2019est ?\",\"isPartOf\":{\"@id\":\"https:\/\/datascientest.com\/#website\"},\"datePublished\":\"2020-11-04T08:52:07+00:00\",\"dateModified\":\"2023-11-09T14:11:38+00:00\",\"author\":{\"@id\":\"https:\/\/datascientest.com\/#\/schema\/person\/7af2361c48e24e79a8aa2360e6e74925\"},\"description\":\"SI vous connaissez le Machine Learning vous avez surement entendu parler du mod\u00e8de de la r\u00e9gression logistique. 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