{"id":15420,"date":"2020-03-21T12:37:51","date_gmt":"2020-03-21T11:37:51","guid":{"rendered":"https:\/\/www.datanovia.com\/en\/?p=15420"},"modified":"2020-03-21T12:37:51","modified_gmt":"2020-03-21T11:37:51","slug":"comment-effectuer-un-test-t-pour-plusieurs-groupes-dans-r","status":"publish","type":"post","link":"https:\/\/www.datanovia.com\/en\/fr\/blog\/comment-effectuer-un-test-t-pour-plusieurs-groupes-dans-r\/","title":{"rendered":"Comment Effectuer un Test T pour Plusieurs Groupes dans R"},"content":{"rendered":"<div class=\"rdoc\">\n<h2 id=\"pr\u00e9requis\">Pr\u00e9requis<\/h2>\n<pre class=\"r\"><code># Charger les packages R requis\r\nlibrary(tidyverse)\r\nlibrary(rstatix)\r\nlibrary(ggpubr)\r\n   \r\n# Pr\u00e9parer les donn\u00e9es et inspecter un \u00e9chantillon al\u00e9atoire des donn\u00e9es\r\ndata(\"PlantGrowth\")\r\nset.seed(1234)\r\nPlantGrowth %&gt;% sample_n_by(group, size = 1)<\/code><\/pre>\n<pre><code>## # A tibble: 3 x 2\r\n##   weight group\r\n##    &lt;dbl&gt; &lt;fct&gt;\r\n## 1   5.58 ctrl \r\n## 2   6.03 trt1 \r\n## 3   4.92 trt2<\/code><\/pre>\n<h2 id=\"statistiques-descriptives\">Statistiques descriptives<\/h2>\n<pre class=\"r\"><code>PlantGrowth %&gt;%\r\n  group_by(group) %&gt;%\r\n  get_summary_stats(weight, type = \"mean_sd\")<\/code><\/pre>\n<pre><code>## # A tibble: 3 x 5\r\n##   group variable     n  mean    sd\r\n##   &lt;fct&gt; &lt;chr&gt;    &lt;dbl&gt; &lt;dbl&gt; &lt;dbl&gt;\r\n## 1 ctrl  weight      10  5.03 0.583\r\n## 2 trt1  weight      10  4.66 0.794\r\n## 3 trt2  weight      10  5.53 0.443<\/code><\/pre>\n<h2 id=\"comparer-la-moyenne-de-plusieurs-groupes-\u00e0-laide-du-test-anova\">Comparer la moyenne de plusieurs groupes \u00e0 l\u2019aide du test ANOVA<\/h2>\n<pre class=\"r\"><code>res.aov &lt;- PlantGrowth %&gt;% anova_test(weight ~ group)\r\nres.aov<\/code><\/pre>\n<pre><code>## ANOVA Table (type II tests)\r\n## \r\n##   Effect DFn DFd    F     p p&lt;.05   ges\r\n## 1  group   2  27 4.85 0.016     * 0.264<\/code><\/pre>\n<div class=\"success\">\n<p>Le tableau ANOVA ci-dessus montre qu\u2019il existe des diff\u00e9rences significatives entre les groupes (p = 0,016), qui sont mises en \u00e9vidence par \"*\", F(2, 27) = 4,85, p = 0,016, eta2[g] = 0,26.<\/p>\n<\/div>\n<h2 id=\"tests-par-paires-pour-plusieurs-groupes\">Tests par paires pour plusieurs groupes<\/h2>\n<pre class=\"r\"><code># Comparaisons par paires\r\npwc &lt;- PlantGrowth %&gt;%\r\n  pairwise_t_test(weight ~ group, p.adjust.method = \"bonferroni\")\r\npwc<\/code><\/pre>\n<pre><code>## # A tibble: 3 x 9\r\n##   .y.    group1 group2    n1    n2       p p.signif  p.adj p.adj.signif\r\n## * &lt;chr&gt;  &lt;chr&gt;  &lt;chr&gt;  &lt;int&gt; &lt;int&gt;   &lt;dbl&gt; &lt;chr&gt;     &lt;dbl&gt; &lt;chr&gt;       \r\n## 1 weight ctrl   trt1      10    10 0.194   ns       0.583  ns          \r\n## 2 weight ctrl   trt2      10    10 0.0877  ns       0.263  ns          \r\n## 3 weight trt1   trt2      10    10 0.00446 **       0.0134 *<\/code><\/pre>\n<h2 id=\"visualisation-boxplots-avec-p-values\">Visualisation : Boxplots avec p-values<\/h2>\n<pre class=\"r\"><code># Afficher les p-values ajust\u00e9es\r\npwc &lt;- pwc %&gt;% add_xy_position(x = \"group\")\r\nggboxplot(PlantGrowth, x = \"group\", y = \"weight\") +\r\n  stat_pvalue_manual(pwc, label = \"p.adj\", tip.length = 0, step.increase = 0.1) +\r\n  labs(\r\n    subtitle = get_test_label(res.aov, detailed = TRUE),\r\n    caption = get_pwc_label(pwc)\r\n    )<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/i.imgur.com\/35uYfDN.png\" alt=\"plot of chunk t-tests-for-multiple-groups-in-r\" \/><\/p>\n<pre class=\"r\"><code># Afficher les niveaux de significativit\u00e9\r\n# Cacher les tests non significatifs\r\nggboxplot(PlantGrowth, x = \"group\", y = \"weight\") +\r\n  stat_pvalue_manual(pwc, hide.ns = TRUE, label = \"p.adj.signif\") +\r\n  labs(\r\n    subtitle = get_test_label(res.aov, detailed = TRUE),\r\n    caption = get_pwc_label(pwc)\r\n    )<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/i.imgur.com\/HULxTse.png\" alt=\"plot of chunk t-tests-for-multiple-groups-in-r\" \/><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Pr\u00e9requis # Charger les packages R requis library(tidyverse) library(rstatix) library(ggpubr) # Pr\u00e9parer les donn\u00e9es et inspecter un \u00e9chantillon al\u00e9atoire des donn\u00e9es data(\u00ab\u00a0PlantGrowth\u00a0\u00bb) set.seed(1234) PlantGrowth %&gt;% sample_n_by(group, size = 1) ## [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":15421,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rating_form_position":"","rating_results_position":"","mr_structured_data_type":"","footnotes":""},"categories":[342],"tags":[350,356],"class_list":["post-15420","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faq-fr","tag-ggpubr-fr","tag-r-stats-fr"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Comment Effectuer un Test T pour Plusieurs Groupes dans R - 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\/blog\/comment-effectuer-un-test-t-pour-plusieurs-groupes-dans-r\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" 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