{"id":11057,"date":"2019-12-08T00:56:17","date_gmt":"2019-12-07T22:56:17","guid":{"rendered":"https:\/\/www.datanovia.com\/en\/?post_type=dt_lessons&#038;p=11057"},"modified":"2019-12-08T01:00:34","modified_gmt":"2019-12-07T23:00:34","slug":"test-des-signes-dans-r","status":"publish","type":"dt_lessons","link":"https:\/\/www.datanovia.com\/en\/fr\/lessons\/test-des-signes-dans-r\/","title":{"rendered":"Test des Signes dans R"},"content":{"rendered":"<div id=\"rdoc\">\n<p>Le <strong>test des signes<\/strong> est utilis\u00e9 pour comparer les m\u00e9dianes des observations appari\u00e9s. C\u2019est une alternative au <em>test t pour \u00e9chantillons appari\u00e9s<\/em> (Chapitre @ref(t-test)) et au <em>test des rangs sign\u00e9s de Wilcoxon<\/em> (Chapitre @ref(wilcoxon-test)) dans le cas o\u00f9 la distribution des diff\u00e9rences entre les valeurs des donn\u00e9es appari\u00e9es n\u2019est ni normale (dans le test t) ni sym\u00e9trique (dans le test de Wilcoxon).<\/p>\n<div class=\"warning\">\n<p>Notez que le test des signes ne fait pas d\u2019hypoth\u00e8ses sur la distribution des donn\u00e9es. Cependant, il sera probablement moins puissant que le test de Wilcoxon et le test t.<\/p>\n<p>Par cons\u00e9quent, si la distribution des diff\u00e9rences entre les deux groupes appari\u00e9s est sym\u00e9trique, vous pourriez envisager d\u2019utiliser le test de Wilcoxon qui est plus puissant compar\u00e9 au test des signes.<\/p>\n<\/div>\n<p>Dans ce chapitre, vous apprendrez comment calculer le test des signes pour \u00e9chantillons appari\u00e9s en utilisant la fonction R <code>sign_test()<\/code> [paquet rstatix].<\/p>\n<p>Sommaire:<\/p>\n<div id=\"TOC\">\n<ul>\n<li><a href=\"#prerequis\">Pr\u00e9requis<\/a><\/li>\n<li><a href=\"#donnees-de-demonstration\">Donn\u00e9es de d\u00e9monstration<\/a><\/li>\n<li><a href=\"#hypotheses-statistiques\">Hypoth\u00e8ses statistiques<\/a><\/li>\n<li><a href=\"#statistiques-descriptives\">Statistiques descriptives<\/a><\/li>\n<li><a href=\"#visualisation\">Visualisation<\/a><\/li>\n<li><a href=\"#calculs\">Calculs<\/a><\/li>\n<li><a href=\"#rapporter\">Rapporter<\/a><\/li>\n<li><a href=\"#resume\">R\u00e9sum\u00e9<\/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=\"prerequis\" 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> offre des fonctions R conviviales pour des analyses statistiques faciles \u00e0 r\u00e9aliser<\/li>\n<li><code>datarium<\/code>: contient les ensembles 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(rstatix)\r\nlibrary(ggpubr)<\/code><\/pre>\n<\/div>\n<div id=\"donnees-de-demonstration\" class=\"section level2\">\n<h2>Donn\u00e9es de d\u00e9monstration<\/h2>\n<p>Ici, nous utiliserons un jeu de donn\u00e9es de d\u00e9monstration <code>mice2<\/code> [package datarium], qui contient le poids de 10 souris avant et apr\u00e8s le traitement.<\/p>\n<pre class=\"r\"><code># Donn\u00e9es larges\r\ndata(\"mice2\", package = \"datarium\")\r\nhead(mice2, 3)<\/code><\/pre>\n<pre><code>##   id before after\r\n## 1  1    187   430\r\n## 2  2    194   404\r\n## 3  3    232   406<\/code><\/pre>\n<pre class=\"r\"><code># Transformez en donn\u00e9es longues : \r\n# rassembler les valeurs de `before` (avant) et `after` (apr\u00e8s) dans la m\u00eame colonne\r\nmice2.long &lt;- mice2 %&gt;%\r\n  gather(key = \"group\", value = \"weight\", before, after)\r\nhead(mice2.long, 3)<\/code><\/pre>\n<pre><code>##   id  group weight\r\n## 1  1 before    187\r\n## 2  2 before    194\r\n## 3  3 before    232<\/code><\/pre>\n<\/div>\n<div id=\"hypotheses-statistiques\" class=\"section level2\">\n<h2>Hypoth\u00e8ses statistiques<\/h2>\n<p>Le test des signes pour \u00e9chantillons appari\u00e9s permet d\u2019\u00e9valuer si la m\u00e9diane des diff\u00e9rences entre les paires est statistiquement significativement diff\u00e9rente de 0.<\/p>\n<ul>\n<li><strong>Hypoth\u00e8ses nulles, H0<\/strong> : m\u00e9diane des diff\u00e9rences appari\u00e9es = 0<\/li>\n<li><strong>Hypoth\u00e8ses alternatives, Ha<\/strong> : la m\u00e9diane des diff\u00e9rences appari\u00e9es est diff\u00e9rente de 0<\/li>\n<\/ul>\n<\/div>\n<div id=\"statistiques-descriptives\" class=\"section level2\">\n<h2>Statistiques descriptives<\/h2>\n<p>Calcul de certaines statistiques sommaires par groupes : m\u00e9diane et intervalle interquartile (IQR).<\/p>\n<pre class=\"r\"><code>mice2.long %&gt;%\r\n  group_by(group) %&gt;%\r\n  get_summary_stats(weight, type = \"median_iqr\")<\/code><\/pre>\n<pre><code>## # A tibble: 2 x 5\r\n##   group  variable     n median   iqr\r\n##   &lt;chr&gt;  &lt;chr&gt;    &lt;dbl&gt;  &lt;dbl&gt; &lt;dbl&gt;\r\n## 1 after  weight      10   405   28.3\r\n## 2 before weight      10   197.  19.2<\/code><\/pre>\n<\/div>\n<div id=\"visualisation\" class=\"section level2\">\n<h2>Visualisation<\/h2>\n<pre class=\"r\"><code>bxp &lt;- ggpaired(mice2.long, x = \"group\", y = \"weight\", \r\n         order = c(\"before\", \"after\"),\r\n         ylab = \"Weight\", xlab = \"Groups\")\r\nbxp<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/r-statistics-2-comparing-groups-means\/figures\/041-sign-test-paired-sign-test-box-plot-1.png\" width=\"364.8\" \/><\/p>\n<\/div>\n<div id=\"calculs\" class=\"section level2\">\n<h2>Calculs<\/h2>\n<p>Question : Y a-t-il des changements significatifs dans le poids des souris apr\u00e8s le traitement ?<\/p>\n<pre class=\"r\"><code>stat.test &lt;- mice2.long  %&gt;%\r\n  sign_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 after  before    10    10        10    10 0.00195 **<\/code><\/pre>\n<\/div>\n<div id=\"rapporter\" class=\"section level2\">\n<h2>Rapporter<\/h2>\n<p>Nous pourrions pr\u00e9senter les r\u00e9sultats comme suit:<\/p>\n<p>Le poids m\u00e9dian des souris avant le traitement est significativement diff\u00e9rent du poids m\u00e9dian apr\u00e8s le traitement en utilisant le test des signes, p-value = 0,002.<\/p>\n<pre class=\"r\"><code>stat.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(\r\n  subtitle = get_test_label(stat.test, detailed= TRUE)\r\n  )<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/r-statistics-2-comparing-groups-means\/figures\/041-sign-test-box-plot-with-p-values-1.png\" width=\"364.8\" \/><\/p>\n<\/div>\n<div id=\"resume\" class=\"section level2\">\n<h2>R\u00e9sum\u00e9<\/h2>\n<p>Ce chapitre d\u00e9crit comment calculer et rapporter le test des signes dans R.<\/p>\n<\/div>\n<\/div>\n<p><!--end rdoc--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le test des signes est utilis\u00e9 pour comparer les m\u00e9dianes d&rsquo;\u00e9chantillons appari\u00e9es. Il s&rsquo;agit d&rsquo;une alternative au test t  et au test de Wilcoxon sur \u00e9chantillons appari\u00e9s, o\u00f9 la distribution des diff\u00e9rences entre les valeurs des donn\u00e9es appari\u00e9es n&rsquo;est ni normale (dans le test t) ni sym\u00e9trique (dans le test de Wilcoxon). Dans ce chapitre, vous apprendrez comment calculer le test des signes des \u00e9chantillons appari\u00e9s dans R <\/p>\n","protected":false},"author":1,"featured_media":11058,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","class_list":["post-11057","dt_lessons","type-dt_lessons","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Test des Signes dans R: Excellente R\u00e9f\u00e9rence - 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\/lessons\/test-des-signes-dans-r\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Test des Signes dans R: Excellente R\u00e9f\u00e9rence - Datanovia\" \/>\n<meta property=\"og:description\" content=\"Le test des signes est utilis\u00e9 pour comparer les m\u00e9dianes d&#039;\u00e9chantillons appari\u00e9es. Il s&#039;agit d&#039;une alternative au test t et au test de Wilcoxon sur \u00e9chantillons appari\u00e9s, o\u00f9 la distribution des diff\u00e9rences entre les valeurs des donn\u00e9es appari\u00e9es n&#039;est ni normale (dans le test t) ni sym\u00e9trique (dans le test de Wilcoxon). 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Dans ce chapitre, vous apprendrez comment calculer le test des signes des \u00e9chantillons appari\u00e9s dans R","og_url":"https:\/\/www.datanovia.com\/en\/fr\/lessons\/test-des-signes-dans-r\/","og_site_name":"Datanovia","article_modified_time":"2019-12-07T23:00:34+00:00","og_image":[{"width":1024,"height":512,"url":"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/2019\/05\/X25994934_559944101012205_930034181282162827_n.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_misc":{"Dur\u00e9e de lecture estim\u00e9e":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.datanovia.com\/en\/fr\/lessons\/test-des-signes-dans-r\/","url":"https:\/\/www.datanovia.com\/en\/fr\/lessons\/test-des-signes-dans-r\/","name":"Test des Signes dans R: Excellente R\u00e9f\u00e9rence - Datanovia","isPartOf":{"@id":"https:\/\/www.datanovia.com\/en\/fr\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.datanovia.com\/en\/fr\/lessons\/test-des-signes-dans-r\/#primaryimage"},"image":{"@id":"https:\/\/www.datanovia.com\/en\/fr\/lessons\/test-des-signes-dans-r\/#primaryimage"},"thumbnailUrl":"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/2019\/05\/X25994934_559944101012205_930034181282162827_n.jpg","datePublished":"2019-12-07T22:56:17+00:00","dateModified":"2019-12-07T23:00:34+00:00","breadcrumb":{"@id":"https:\/\/www.datanovia.com\/en\/fr\/lessons\/test-des-signes-dans-r\/#breadcrumb"},"inLanguage":"fr-FR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.datanovia.com\/en\/fr\/lessons\/test-des-signes-dans-r\/"]}]},{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/www.datanovia.com\/en\/fr\/lessons\/test-des-signes-dans-r\/#primaryimage","url":"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/2019\/05\/X25994934_559944101012205_930034181282162827_n.jpg","contentUrl":"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/2019\/05\/X25994934_559944101012205_930034181282162827_n.jpg","width":1024,"height":512},{"@type":"BreadcrumbList","@id":"https:\/\/www.datanovia.com\/en\/fr\/lessons\/test-des-signes-dans-r\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.datanovia.com\/en\/fr\/"},{"@type":"ListItem","position":2,"name":"Le\u00e7ons","item":"https:\/\/www.datanovia.com\/en\/fr\/lessons\/"},{"@type":"ListItem","position":3,"name":"Test des Signes dans R"}]},{"@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_lessons\/11057","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.datanovia.com\/en\/fr\/wp-json\/wp\/v2\/dt_lessons"}],"about":[{"href":"https:\/\/www.datanovia.com\/en\/fr\/wp-json\/wp\/v2\/types\/dt_lessons"}],"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=11057"}],"version-history":[{"count":0,"href":"https:\/\/www.datanovia.com\/en\/fr\/wp-json\/wp\/v2\/dt_lessons\/11057\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.datanovia.com\/en\/fr\/wp-json\/wp\/v2\/media\/11058"}],"wp:attachment":[{"href":"https:\/\/www.datanovia.com\/en\/fr\/wp-json\/wp\/v2\/media?parent=11057"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}