{"id":15172,"date":"2020-03-10T07:37:52","date_gmt":"2020-03-10T06:37:52","guid":{"rendered":"https:\/\/www.datanovia.com\/en\/?post_type=dt_courses&#038;p=15172"},"modified":"2020-03-10T07:37:52","modified_gmt":"2020-03-10T06:37:52","slug":"test-t-l-essentiel-definition-formule-et-calcul","status":"publish","type":"dt_courses","link":"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/","title":{"rendered":"Test T &#8211; L&rsquo; Essentiel : D\u00e9finition, Formule et Calcul"},"content":{"rendered":"<div id=\"rdoc\">\n<p>Le <strong>test T<\/strong> peut \u00eatre d\u00e9fini comme un test statistique utilis\u00e9 pour comparer deux moyennes. Ce guide fournit de multiples tutoriels d\u00e9crivant les diff\u00e9rents types de tests T, notamment:<\/p>\n<ul>\n<li><em>tests-t pour \u00e9chantillon unique<\/em>. Comparer la moyenne d\u2019un \u00e9chantillon \u00e0 une moyenne standard connue.<\/li>\n<li><em>t-test pour \u00e9chantillons ind\u00e9pendants : Test t de Student et test t de Welch<\/em>. Comparer deux groupes ind\u00e9pendants<\/li>\n<li><em>test-t pour \u00e9chantillons appari\u00e9s<\/em>. Comparer deux \u00e9chantillons reli\u00e9s entre eux.<\/li>\n<\/ul>\n<p>Vous apprendrez la formule du <em>test t<\/em> et comment:<\/p>\n<ul>\n<li><strong>Calculez les diff\u00e9rents t-tests dans R<\/strong><\/li>\n<li><strong>V\u00e9rifier les hypoth\u00e8ses du test t<\/strong><\/li>\n<li><strong>Calculez et rapportez la taille de l\u2019effet du test t<\/strong> en utilisant le <em>d de Cohen<\/em>.<\/li>\n<\/ul>\n<p>Sommaire:<\/p>\n<div id=\"TOC\">\n<ul>\n<li><a href=\"#pr\u00e9requis\">Pr\u00e9requis<\/a><\/li>\n<li><a href=\"#exemples-de-codes-r\">Exemples de codes R<\/a><\/li>\n<\/ul>\n<\/div>\n<div class='dt-sc-hr-invisible-medium  '><\/div>\n<div class='dt-sc-ico-content type1'><div class='custom-icon' ><a href='https:\/\/www.datanovia.com\/en\/fr\/produit\/pratiques-des-statistiques-dans-r-pour-comparaison-de-groupes-variables-numeriques\/' target='_blank'><span class='fa fa-book'><\/span><\/a><\/div><h4><a href='https:\/\/www.datanovia.com\/en\/fr\/produit\/pratiques-des-statistiques-dans-r-pour-comparaison-de-groupes-variables-numeriques\/' target='_blank'> Livre Apparent\u00e9 <\/a><\/h4>Pratique des Statistiques dans R II - Comparaison de Groupes: Variables Num\u00e9riques<\/div>\n<div class='dt-sc-hr-invisible-medium  '><\/div>\n<div id=\"pr\u00e9requis\" class=\"section level2\">\n<h2>Pr\u00e9requis<\/h2>\n<p>Assurez-vous d\u2019avoir install\u00e9 les paquets R suivants:<\/p>\n<ul>\n<li><code>tidyverse<\/code> pour la manipulation et la visualisation des donn\u00e9es<\/li>\n<li><code>ggpubr<\/code> pour cr\u00e9er facilement des graphiques pr\u00eats \u00e0 la publication<\/li>\n<li><code>rstatix<\/code> contient des fonctions R facilitant les analyses statistiques.<\/li>\n<li><code>datarium<\/code>: contient les jeux de donn\u00e9es requis pour ce chapitre.<\/li>\n<\/ul>\n<p>Commencez par charger les packages requis suivants:<\/p>\n<pre class=\"r\"><code>library(tidyverse)\r\nlibrary(ggpubr)\r\nlibrary(rstatix)<\/code><\/pre>\n<\/div>\n<div id=\"exemples-de-codes-r\" class=\"section level2\">\n<h2>Exemples de codes R<\/h2>\n<p>Comparaison de deux groupes ind\u00e9pendants:<\/p>\n<pre class=\"r\"><code># Pr\u00e9paration des donn\u00e9es\r\ndata(\"genderweight\", package = \"datarium\")\r\nhead(genderweight, 3)<\/code><\/pre>\n<pre><code>## # A tibble: 3 x 3\r\n##   id    group weight\r\n##   &lt;fct&gt; &lt;fct&gt;  &lt;dbl&gt;\r\n## 1 1     F       61.6\r\n## 2 2     F       64.6\r\n## 3 3     F       66.2<\/code><\/pre>\n<pre class=\"r\"><code># Test statistique\r\nstat.test &lt;- genderweight %&gt;% \r\n  t_test(weight ~ group) %&gt;%\r\n  add_significance()\r\nstat.test<\/code><\/pre>\n<pre><code>## # A tibble: 1 x 9\r\n##   .y.    group1 group2    n1    n2 statistic    df        p p.signif\r\n##   &lt;chr&gt;  &lt;chr&gt;  &lt;chr&gt;  &lt;int&gt; &lt;int&gt;     &lt;dbl&gt; &lt;dbl&gt;    &lt;dbl&gt; &lt;chr&gt;   \r\n## 1 weight F      M         20    20     -20.8  26.9 4.30e-18 ****<\/code><\/pre>\n<pre class=\"r\"><code># Visualisation : \r\n# Cr\u00e9er un box-plot\r\nbxp &lt;- ggboxplot(\r\n  genderweight, x = \"group\", y = \"weight\", \r\n  ylab = \"Weight\", xlab = \"Groups\", add = \"jitter\"\r\n  )\r\n# Ajouter la p-value et les niveaux de significativit\u00e9\r\nstat.test &lt;- stat.test %&gt;% add_xy_position(x = \"group\")\r\nbxp + \r\n  stat_pvalue_manual(stat.test, tip.length = 0) +\r\n  labs(subtitle = get_test_label(stat.test, detailed = TRUE))<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/i.imgur.com\/eAWDuLf.png\" width=\"412.8\" \/><\/p>\n<\/div>\n<\/div>\n<p><!--end rdoc--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le test T peut \u00eatre d\u00e9fini comme un test statistique utilis\u00e9 pour comparer deux moyennes. Ce guide fournit de multiples tutoriels d\u00e9crivant les diff\u00e9rents types de tests T, notamment: tests-t [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":15174,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","class_list":["post-15172","dt_courses","type-dt_courses","status-publish","has-post-thumbnail","hentry","course_category-biostatistique","course_category-comparaison-de-moyennes","course_category-statistiques-de-base"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Test T - L&#039; Essentiel : D\u00e9finition, Formule et Calcul - Datanovia<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Test T - L&#039; Essentiel : D\u00e9finition, Formule et Calcul - Datanovia\" \/>\n<meta property=\"og:description\" content=\"Le test T peut \u00eatre d\u00e9fini comme un test statistique utilis\u00e9 pour comparer deux moyennes. Ce guide fournit de multiples tutoriels d\u00e9crivant les diff\u00e9rents types de tests T, notamment: tests-t [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/\" \/>\n<meta property=\"og:site_name\" content=\"Datanovia\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/2020\/03\/eAWDuLf.png\" \/>\n\t<meta property=\"og:image:width\" content=\"825\" \/>\n\t<meta property=\"og:image:height\" content=\"633\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/\",\"url\":\"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/\",\"name\":\"Test T - L' Essentiel : D\u00e9finition, Formule et Calcul - Datanovia\",\"isPartOf\":{\"@id\":\"https:\/\/www.datanovia.com\/en\/fr\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/2020\/03\/eAWDuLf.png\",\"datePublished\":\"2020-03-10T06:37:52+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/#primaryimage\",\"url\":\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/2020\/03\/eAWDuLf.png\",\"contentUrl\":\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/2020\/03\/eAWDuLf.png\",\"width\":825,\"height\":633,\"caption\":\"eAWDuLf.png\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.datanovia.com\/en\/fr\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Cours\",\"item\":\"https:\/\/www.datanovia.com\/en\/fr\/courses\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Test T &#8211; L&rsquo; Essentiel : D\u00e9finition, Formule et Calcul\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.datanovia.com\/en\/fr\/#website\",\"url\":\"https:\/\/www.datanovia.com\/en\/fr\/\",\"name\":\"Datanovia\",\"description\":\"Exploration de Donn\u00e9es et Statistiques pour l'Aide \u00e0 la D\u00e9cision\",\"publisher\":{\"@id\":\"https:\/\/www.datanovia.com\/en\/fr\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.datanovia.com\/en\/fr\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.datanovia.com\/en\/fr\/#organization\",\"name\":\"Datanovia\",\"url\":\"https:\/\/www.datanovia.com\/en\/fr\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/www.datanovia.com\/en\/fr\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/2018\/09\/datanovia-logo.png\",\"contentUrl\":\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/2018\/09\/datanovia-logo.png\",\"width\":98,\"height\":99,\"caption\":\"Datanovia\"},\"image\":{\"@id\":\"https:\/\/www.datanovia.com\/en\/fr\/#\/schema\/logo\/image\/\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Test T - L' Essentiel : D\u00e9finition, Formule et Calcul - Datanovia","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/","og_locale":"fr_FR","og_type":"article","og_title":"Test T - L' Essentiel : D\u00e9finition, Formule et Calcul - Datanovia","og_description":"Le test T peut \u00eatre d\u00e9fini comme un test statistique utilis\u00e9 pour comparer deux moyennes. Ce guide fournit de multiples tutoriels d\u00e9crivant les diff\u00e9rents types de tests T, notamment: tests-t [&hellip;]","og_url":"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/","og_site_name":"Datanovia","og_image":[{"width":825,"height":633,"url":"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/2020\/03\/eAWDuLf.png","type":"image\/png"}],"twitter_card":"summary_large_image","twitter_misc":{"Dur\u00e9e de lecture estim\u00e9e":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/","url":"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/","name":"Test T - L' Essentiel : D\u00e9finition, Formule et Calcul - Datanovia","isPartOf":{"@id":"https:\/\/www.datanovia.com\/en\/fr\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/#primaryimage"},"image":{"@id":"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/#primaryimage"},"thumbnailUrl":"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/2020\/03\/eAWDuLf.png","datePublished":"2020-03-10T06:37:52+00:00","breadcrumb":{"@id":"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/#breadcrumb"},"inLanguage":"fr-FR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/"]}]},{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/#primaryimage","url":"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/2020\/03\/eAWDuLf.png","contentUrl":"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/2020\/03\/eAWDuLf.png","width":825,"height":633,"caption":"eAWDuLf.png"},{"@type":"BreadcrumbList","@id":"https:\/\/www.datanovia.com\/en\/fr\/courses\/test-t-l-essentiel-definition-formule-et-calcul\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.datanovia.com\/en\/fr\/"},{"@type":"ListItem","position":2,"name":"Cours","item":"https:\/\/www.datanovia.com\/en\/fr\/courses\/"},{"@type":"ListItem","position":3,"name":"Test T &#8211; L&rsquo; Essentiel : D\u00e9finition, Formule et Calcul"}]},{"@type":"WebSite","@id":"https:\/\/www.datanovia.com\/en\/fr\/#website","url":"https:\/\/www.datanovia.com\/en\/fr\/","name":"Datanovia","description":"Exploration de Donn\u00e9es et Statistiques pour l'Aide \u00e0 la D\u00e9cision","publisher":{"@id":"https:\/\/www.datanovia.com\/en\/fr\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.datanovia.com\/en\/fr\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fr-FR"},{"@type":"Organization","@id":"https:\/\/www.datanovia.com\/en\/fr\/#organization","name":"Datanovia","url":"https:\/\/www.datanovia.com\/en\/fr\/","logo":{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/www.datanovia.com\/en\/fr\/#\/schema\/logo\/image\/","url":"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/2018\/09\/datanovia-logo.png","contentUrl":"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/2018\/09\/datanovia-logo.png","width":98,"height":99,"caption":"Datanovia"},"image":{"@id":"https:\/\/www.datanovia.com\/en\/fr\/#\/schema\/logo\/image\/"}}]}},"multi-rating":{"mr_rating_results":[]},"_links":{"self":[{"href":"https:\/\/www.datanovia.com\/en\/fr\/wp-json\/wp\/v2\/dt_courses\/15172","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.datanovia.com\/en\/fr\/wp-json\/wp\/v2\/dt_courses"}],"about":[{"href":"https:\/\/www.datanovia.com\/en\/fr\/wp-json\/wp\/v2\/types\/dt_courses"}],"author":[{"embeddable":true,"href":"https:\/\/www.datanovia.com\/en\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.datanovia.com\/en\/fr\/wp-json\/wp\/v2\/comments?post=15172"}],"version-history":[{"count":0,"href":"https:\/\/www.datanovia.com\/en\/fr\/wp-json\/wp\/v2\/dt_courses\/15172\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.datanovia.com\/en\/fr\/wp-json\/wp\/v2\/media\/15174"}],"wp:attachment":[{"href":"https:\/\/www.datanovia.com\/en\/fr\/wp-json\/wp\/v2\/media?parent=15172"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}