{"id":15448,"date":"2020-03-22T09:16:09","date_gmt":"2020-03-22T08:16:09","guid":{"rendered":"https:\/\/www.datanovia.com\/en\/?p=15448"},"modified":"2020-03-22T09:16:09","modified_gmt":"2020-03-22T08:16:09","slug":"comment-effectuer-plusieurs-tests-t-apparies-deux-par-deux-dans-r","status":"publish","type":"post","link":"https:\/\/www.datanovia.com\/en\/fr\/blog\/comment-effectuer-plusieurs-tests-t-apparies-deux-par-deux-dans-r\/","title":{"rendered":"Comment Effectuer Plusieurs Tests-T Appari\u00e9s Deux par Deux 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)<\/code><\/pre>\n<h2 id=\"pr\u00e9paration-des-donn\u00e9es\">Pr\u00e9paration des donn\u00e9es<\/h2>\n<p>Nous utiliserons le jeu de donn\u00e9es sur l\u2019estime de soi mesur\u00e9 sur trois points temporels. Les donn\u00e9es sont disponibles dans le package datarium.<\/p>\n<pre class=\"r\"><code># Format large\r\ndata(\"selfesteem\", package = \"datarium\")\r\nhead(selfesteem, 3)<\/code><\/pre>\n<pre><code>## # A tibble: 3 x 4\r\n##      id    t1    t2    t3\r\n##   &lt;int&gt; &lt;dbl&gt; &lt;dbl&gt; &lt;dbl&gt;\r\n## 1     1  4.01  5.18  7.11\r\n## 2     2  2.56  6.91  6.31\r\n## 3     3  3.24  4.44  9.78<\/code><\/pre>\n<pre class=\"r\"><code># Rassembler les colonnes t1, t2 et t3 en format long\r\n# Convertir l'identifiant et le temps en facteurs\r\nselfesteem &lt;- selfesteem %&gt;%\r\n  gather(key = \"time\", value = \"score\", t1, t2, t3) %&gt;%\r\n  convert_as_factor(id, time)\r\nhead(selfesteem, 3)<\/code><\/pre>\n<pre><code>## # A tibble: 3 x 3\r\n##   id    time  score\r\n##   &lt;fct&gt; &lt;fct&gt; &lt;dbl&gt;\r\n## 1 1     t1     4.01\r\n## 2 2     t1     2.56\r\n## 3 3     t1     3.24<\/code><\/pre>\n<h2 id=\"effectuer-des-tests-t-appari\u00e9s-deux-par-deux\">Effectuer des tests-t appari\u00e9s deux par deux<\/h2>\n<p>Vous pouvez effectuer plusieurs <strong>tests t appari\u00e9s<\/strong> par paires entre les niveaux du facteur intra-sujets (ici <code>time<\/code>). Les p-values sont ajust\u00e9es \u00e0 l\u2019aide de la m\u00e9thode de correction des tests multiples de Bonferroni.<\/p>\n<pre class=\"r\"><code>stat.test &lt;- selfesteem %&gt;%\r\n  pairwise_t_test(\r\n    score ~ time, paired = TRUE,\r\n    p.adjust.method = \"bonferroni\"\r\n    )\r\nstat.test<\/code><\/pre>\n<pre><code>## # A tibble: 3 x 10\r\n##   .y.   group1 group2    n1    n2 statistic    df           p    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;dbl&gt;       &lt;dbl&gt;    &lt;dbl&gt; &lt;chr&gt;       \r\n## 1 score t1     t2        10    10     -4.97     9 0.000772    0.002    **          \r\n## 2 score t1     t3        10    10    -13.2      9 0.000000334 0.000001 ****        \r\n## 3 score t2     t3        10    10     -4.87     9 0.000886    0.003    **<\/code><\/pre>\n<div class=\"success\">\n<p>Toutes les diff\u00e9rences par paires sont statistiquement significatives.<\/p>\n<\/div>\n<h2 id=\"visualisation-boxplots-avec-p-values\">Visualisation : Boxplots avec p-values<\/h2>\n<pre class=\"r\"><code># Cr\u00e9er le graphique\r\nmyplot &lt;- ggboxplot(selfesteem, x = \"time\", y = \"score\", add = \"point\")\r\n# Ajouter les p-values des tests statistiques\r\nstat.test &lt;- stat.test %&gt;% add_xy_position(x = \"time\")\r\nmyplot + stat_pvalue_manual(stat.test, label = \"p.adj.signif\")<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/i.imgur.com\/qeTkhtK.png\" alt=\"plot of chunk paired-pairwise-t-test-in-r-boxplots\" \/><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Pr\u00e9requis # Charger les packages R requis library(tidyverse) library(rstatix) library(ggpubr) Pr\u00e9paration des donn\u00e9es Nous utiliserons le jeu de donn\u00e9es sur l\u2019estime de soi mesur\u00e9 sur trois points temporels. Les donn\u00e9es [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":15449,"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-15448","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 Plusieurs Tests-T Appari\u00e9s Deux par Deux 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-plusieurs-tests-t-apparies-deux-par-deux-dans-r\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comment Effectuer Plusieurs Tests-T Appari\u00e9s Deux par Deux dans R - Datanovia\" \/>\n<meta property=\"og:description\" content=\"Pr\u00e9requis # Charger les packages R requis library(tidyverse) library(rstatix) library(ggpubr) Pr\u00e9paration des donn\u00e9es Nous utiliserons le jeu de donn\u00e9es sur l\u2019estime de soi mesur\u00e9 sur trois points temporels. 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