{"id":16784,"date":"2020-06-03T20:20:41","date_gmt":"2020-06-03T19:20:41","guid":{"rendered":"https:\/\/www.datanovia.com\/en\/?p=16784"},"modified":"2020-06-03T20:20:41","modified_gmt":"2020-06-03T19:20:41","slug":"comment-ajouter-des-p-values-sur-des-ggplots-horizontaux","status":"publish","type":"post","link":"https:\/\/www.datanovia.com\/en\/fr\/blog\/comment-ajouter-des-p-values-sur-des-ggplots-horizontaux\/","title":{"rendered":"Comment Ajouter des P-Values sur des GGPLOTS Horizontaux"},"content":{"rendered":"<div id=\"rdoc\">\n<p>Cet article d\u00e9crit comment <strong>ajouter des p-values sur des ggplots horizontaux<\/strong> en utilisant la fonction R <code>stat_pvalue_manual()<\/code> disponible dans le package R <code>ggpubr<\/code>.<\/p>\n<ul>\n<li>Les graphiques horizontaux peuvent \u00eatre cr\u00e9\u00e9s en utilisant la fonction <code>coord_flip()<\/code> [dans le package ggplot2].<\/li>\n<li>Lorsque vous ajoutez des p-values \u00e0 un ggplot horizontal, vous devez sp\u00e9cifier l\u2019option <code>coord.flip = TRUE<\/code> dans la fonction <code>stat_pvalue_manual()<\/code> [dans le package ggpubr]. Les options <code>vjust<\/code> (ajustement vertical) et <code>hjust<\/code> (ajustement horizontal) peuvent \u00e9galement \u00eatre sp\u00e9cifi\u00e9es pour adapter la position des \u00e9tiquettes de p-values.<\/li>\n<\/ul>\n<p>Notez que, dans certains cas, les \u00e9tiquettes de p-values sont partiellement cach\u00e9es par la bordure sup\u00e9rieure du graphique. Dans ce cas, la fonction ggplot2 <code>scale_y_continuous(expand = expansion(mult = c(0, 0.1)))<\/code> peut \u00eatre utilis\u00e9e pour <a href=\"https:\/\/www.datanovia.com\/en\/fr\/blog\/ggplot-facet-comment-ajouter-de-lespace-entre-les-etiquettes-en-haut-du-graphique-et-la-bordure-du-plot\/\">ajouter des espaces entre les \u00e9tiquettes et la bordure sup\u00e9rieure du graphique<\/a>. L\u2019option <code>mult = c(0, 0.1)<\/code> indique que des espaces de 0% et 10% sont respectivement ajout\u00e9s en bas et en haut du graphique.<\/p>\n<p>Sommaire:<\/p>\n<div id=\"TOC\">\n<ul>\n<li><a href=\"#pr\u00e9requis\">Pr\u00e9requis<\/a><\/li>\n<li><a href=\"#pr\u00e9paration-des-donn\u00e9es\">Pr\u00e9paration des donn\u00e9es<\/a><\/li>\n<li><a href=\"#cr\u00e9er-des-graphiques-simples\">Cr\u00e9er des graphiques simples<\/a><\/li>\n<li><a href=\"#comparaisons-par-paires\">Comparaisons par paires<\/a>\n<ul>\n<li><a href=\"#test-statistique\">Test statistique<\/a><\/li>\n<li><a href=\"#graphiques-verticaux-avec-p-values\">Graphiques verticaux avec p-values<\/a><\/li>\n<li><a href=\"#graphiques-horizontaux-avec-p-values\">Graphiques horizontaux avec p-values<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"#comparaisons-par-rapport-\u00e0-un-groupe-de-r\u00e9f\u00e9rence\">Comparaisons par rapport \u00e0 un groupe de r\u00e9f\u00e9rence<\/a>\n<ul>\n<li><a href=\"#tests-statistiques\">Tests statistiques<\/a><\/li>\n<li><a href=\"#graphiques-verticaux-avec-p-values-1\">Graphiques verticaux avec p-values<\/a><\/li>\n<li><a href=\"#graphiques-horizontaux-avec-p-values-1\">Graphiques horizontaux avec p-values<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"#conclusion\">Conclusion<\/a><\/li>\n<\/ul>\n<\/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>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<\/ul>\n<p>Commencez par charger les packages requis suivants:<\/p>\n<pre class=\"r\"><code>library(ggpubr)\r\nlibrary(rstatix)<\/code><\/pre>\n<\/div>\n<div id=\"pr\u00e9paration-des-donn\u00e9es\" class=\"section level2\">\n<h2>Pr\u00e9paration des donn\u00e9es<\/h2>\n<pre class=\"r\"><code># Transformer `dose` en variable factorielle\r\ndf &lt;- ToothGrowth\r\ndf$dose &lt;- as.factor(df$dose)\r\nhead(df, 3)<\/code><\/pre>\n<pre><code>##    len supp dose\r\n## 1  4.2   VC  0.5\r\n## 2 11.5   VC  0.5\r\n## 3  7.3   VC  0.5<\/code><\/pre>\n<\/div>\n<div id=\"cr\u00e9er-des-graphiques-simples\" class=\"section level2\">\n<h2>Cr\u00e9er des graphiques simples<\/h2>\n<pre class=\"r\"><code># Box plots\r\nbxp &lt;- ggboxplot(df, x = \"dose\", y = \"len\", fill = \"dose\", \r\n                 palette = c(\"#00AFBB\", \"#E7B800\", \"#FC4E07\"))\r\n\r\n# Bar plots repr\u00e9sentant la moyenne +\/- l'\u00e9cart-type\r\nbp &lt;- ggbarplot(df, x = \"dose\", y = \"len\", add = \"mean_sd\", fill = \"dose\", \r\n                palette = c(\"#00AFBB\", \"#E7B800\", \"#FC4E07\"))<\/code><\/pre>\n<\/div>\n<div id=\"comparaisons-par-paires\" class=\"section level2\">\n<h2>Comparaisons par paires<\/h2>\n<div id=\"test-statistique\" class=\"section level3\">\n<h3>Test statistique<\/h3>\n<p>Dans l\u2019exemple suivant, nous allons effectuer un test-T en utilisant la fonction <code>t_test()<\/code> [package rstatix]. Il est \u00e9galement possible d\u2019utiliser la fonction <code>wilcox_test()<\/code>.<\/p>\n<pre class=\"r\"><code>stat.test &lt;- df %&gt;% t_test(len ~ dose)\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 len   0.5    1         20    20     -6.48  38.0 1.27e- 7 2.54e- 7 ****        \r\n## 2 len   0.5    2         20    20    -11.8   36.9 4.40e-14 1.32e-13 ****        \r\n## 3 len   1      2         20    20     -4.90  37.1 1.91e- 5 1.91e- 5 ****<\/code><\/pre>\n<\/div>\n<div id=\"graphiques-verticaux-avec-p-values\" class=\"section level3\">\n<h3>Graphiques verticaux avec p-values<\/h3>\n<pre class=\"r\"><code># Box plot\r\nstat.test &lt;- stat.test %&gt;% add_xy_position(x = \"dose\")\r\nbxp + stat_pvalue_manual(stat.test, label = \"p.adj.signif\", tip.length = 0.01)\r\n\r\n# Bar plot\r\nstat.test &lt;- stat.test %&gt;% add_xy_position(fun = \"mean_sd\", x = \"dose\")\r\nbp + stat_pvalue_manual(stat.test, label = \"p.adj.signif\", tip.length = 0.01)<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggpubr\/figures\/065-add-p-values-to-horizontal-ggplot-vertical-plots-with-pairwise-comparisons-p-values-1.png\" width=\"288\" \/><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggpubr\/figures\/065-add-p-values-to-horizontal-ggplot-vertical-plots-with-pairwise-comparisons-p-values-2.png\" width=\"288\" \/><\/p>\n<\/div>\n<div id=\"graphiques-horizontaux-avec-p-values\" class=\"section level3\">\n<h3>Graphiques horizontaux avec p-values<\/h3>\n<div id=\"utiliser-les-niveaux-de-significativit\u00e9-des-p-values-ajust\u00e9es-comme-\u00e9tiquettes\" class=\"section level4\">\n<h4>Utiliser les niveaux de significativit\u00e9 des p-values ajust\u00e9es comme \u00e9tiquettes<\/h4>\n<pre class=\"r\"><code># Box plot horizontal avec p-values\r\nstat.test &lt;- stat.test %&gt;% add_xy_position(x = \"dose\")\r\nbxp + \r\n  stat_pvalue_manual(\r\n    stat.test, label = \"p.adj.signif\", tip.length = 0.01,\r\n    coord.flip = TRUE\r\n    ) +\r\n  coord_flip()\r\n\r\n# Bar plot horizontal avec p-values\r\nstat.test &lt;- stat.test %&gt;% add_xy_position(fun = \"mean_sd\", x = \"dose\")\r\nbp + stat_pvalue_manual(\r\n  stat.test, label = \"p.adj.signif\", tip.length = 0.01,\r\n  coord.flip = TRUE\r\n  ) +\r\n  coord_flip()<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggpubr\/figures\/065-add-p-values-to-horizontal-ggplot-horizontal-plots-with-pairwise-comparisons-p-values-1.png\" width=\"288\" \/><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggpubr\/figures\/065-add-p-values-to-horizontal-ggplot-horizontal-plots-with-pairwise-comparisons-p-values-2.png\" width=\"288\" \/><\/p>\n<\/div>\n<div id=\"utiliser-les-p-values-ajust\u00e9es-comme-\u00e9tiquettes\" class=\"section level4\">\n<h4>Utiliser les p-values ajust\u00e9es comme \u00e9tiquettes<\/h4>\n<pre class=\"r\"><code># Utilisation de `p.adj` comme \u00e9tiquettes\r\nstat.test &lt;- stat.test %&gt;% add_xy_position(x = \"dose\")\r\nbxp + \r\n  stat_pvalue_manual(\r\n    stat.test, label = \"p.adj\", tip.length = 0.01,\r\n    coord.flip = TRUE\r\n    ) +\r\n  coord_flip()<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggpubr\/figures\/065-add-p-values-to-horizontal-ggplot-pairwise-comparisons-adjusted-p-values-1.png\" width=\"384\" \/><\/p>\n<pre class=\"r\"><code># Changer l'angle d'orientation des p-values\r\n# Ajustez la position des p-values en utilisant vjust et hjust\r\n# Ajoutez des espaces entre les \u00e9tiquettes et la bordure du graphique\r\nbxp + \r\n  stat_pvalue_manual(\r\n    stat.test, label = \"p.adj\", tip.length = 0.01,\r\n    coord.flip = TRUE, angle = 0, \r\n    hjust = 0, vjust = c(0, 1.2, 0)\r\n    ) +\r\n  scale_y_continuous(expand = expansion(mult = c(0.05, 0.3))) + \r\n  coord_flip() <\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggpubr\/figures\/065-add-p-values-to-horizontal-ggplot-pairwise-comparisons-adjusted-p-values-2.png\" width=\"384\" \/><\/p>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"comparaisons-par-rapport-\u00e0-un-groupe-de-r\u00e9f\u00e9rence\" class=\"section level2\">\n<h2>Comparaisons par rapport \u00e0 un groupe de r\u00e9f\u00e9rence<\/h2>\n<div id=\"tests-statistiques\" class=\"section level3\">\n<h3>Tests statistiques<\/h3>\n<pre class=\"r\"><code>stat.test &lt;- df %&gt;% t_test(len ~ dose, ref.group = \"0.5\") \r\nstat.test<\/code><\/pre>\n<pre><code>## # A tibble: 2 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 len   0.5    1         20    20     -6.48  38.0 1.27e- 7 1.27e- 7 ****        \r\n## 2 len   0.5    2         20    20    -11.8   36.9 4.40e-14 8.80e-14 ****<\/code><\/pre>\n<\/div>\n<div id=\"graphiques-verticaux-avec-p-values-1\" class=\"section level3\">\n<h3>Graphiques verticaux avec p-values<\/h3>\n<pre class=\"r\"><code># Box plot verticale avec p-values\r\nstat.test &lt;- stat.test %&gt;% add_xy_position(x = \"dose\")\r\nbxp + \r\n  stat_pvalue_manual(stat.test, label = \"p.adj\", tip.length = 0.01) +\r\n  scale_y_continuous(expand = expansion(mult = c(0.05, 0.1)))\r\n\r\n# Bar plot vertical avec p-values\r\nstat.test &lt;- stat.test %&gt;% add_xy_position(fun = \"mean_sd\", x = \"dose\")\r\nbp + \r\n  stat_pvalue_manual(stat.test, label = \"p.adj.signif\", tip.length = 0.01) +\r\n  scale_y_continuous(expand = expansion(mult = c(0.05, 0.1)))<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggpubr\/figures\/065-add-p-values-to-horizontal-ggplot-vertical-plot-comparisons-against-reference-groups-1.png\" width=\"288\" \/><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggpubr\/figures\/065-add-p-values-to-horizontal-ggplot-vertical-plot-comparisons-against-reference-groups-2.png\" width=\"288\" \/><\/p>\n<\/div>\n<div id=\"graphiques-horizontaux-avec-p-values-1\" class=\"section level3\">\n<h3>Graphiques horizontaux avec p-values<\/h3>\n<pre class=\"r\"><code># Box plot horizontal avec p-values\r\nstat.test &lt;- stat.test %&gt;% add_xy_position(x = \"dose\")\r\nbxp + \r\n  stat_pvalue_manual(\r\n    stat.test, label = \"p.adj\", tip.length = 0.01, \r\n    coord.flip = TRUE\r\n    ) +\r\n  scale_y_continuous(expand = expansion(mult = c(0.05, 0.1))) +\r\n  coord_flip()\r\n\r\n# Bar plot horizontal avec p-values\r\nstat.test &lt;- stat.test %&gt;% add_xy_position(fun = \"mean_sd\", x = \"dose\")\r\nbp + \r\n  stat_pvalue_manual(\r\n    stat.test, label = \"p.adj\", tip.length = 0.01,\r\n    coord.flip = TRUE\r\n    ) +\r\n  scale_y_continuous(expand = expansion(mult = c(0.05, 0.1))) +\r\n  coord_flip()<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggpubr\/figures\/065-add-p-values-to-horizontal-ggplot-horizontal-plot-comparisons-against-reference-groups-1.png\" width=\"288\" \/><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggpubr\/figures\/065-add-p-values-to-horizontal-ggplot-horizontal-plot-comparisons-against-reference-groups-2.png\" width=\"288\" \/><\/p>\n<pre class=\"r\"><code># Indiquer les p-values \u00e0 la position x = \"groupe2\"\r\nstat.test &lt;- stat.test %&gt;% add_xy_position(x = \"dose\")\r\nbxp + \r\n  stat_pvalue_manual(\r\n    stat.test, label = \"p = {p.adj}\", tip.length = 0.01, \r\n    coord.flip = TRUE, x = \"group2\", hjust = 0.4\r\n    ) +\r\n  scale_y_continuous(expand = expansion(mult = c(0.05, 0.2))) +\r\n  coord_flip()\r\n\r\n# Rendre les p-values horizontales en utilisant l'option angle\r\nstat.test &lt;- stat.test %&gt;% add_xy_position(x = \"dose\")\r\nbxp + \r\n  stat_pvalue_manual(\r\n    stat.test, label = \"p = {p.adj}\", tip.length = 0.01, \r\n    coord.flip = TRUE, x = \"group2\", angle = 90\r\n    ) +\r\n  scale_y_continuous(expand = expansion(mult = c(0.05, 0.1))) +\r\n  scale_x_discrete(expand = expansion(mult = c(0.05, 0.3))) +\r\n  coord_flip()<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggpubr\/figures\/065-add-p-values-to-horizontal-ggplot-horizontal-plot-comparisons-against-reference-groups-no-bracket-1.png\" width=\"288\" \/><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggpubr\/figures\/065-add-p-values-to-horizontal-ggplot-horizontal-plot-comparisons-against-reference-groups-no-bracket-2.png\" width=\"288\" \/><\/p>\n<\/div>\n<\/div>\n<div id=\"conclusion\" class=\"section level2\">\n<h2>Conclusion<\/h2>\n<p>Cet article d\u00e9crit comment <strong>ajouter des p-values sur des ggplots horizontaux<\/strong> en utilisant la fonction R <code>stat_pvalue_manual()<\/code> disponible dans le package R <code>ggpubr<\/code>. Voir d\u2019autres questions apparent\u00e9es fr\u00e9quemment pos\u00e9es : <a href=\"https:\/\/www.datanovia.com\/en\/fr\/blog\/tag\/ggpubr-fr\/\">ggpubr FAQ<\/a>.<\/p>\n<\/div>\n<\/div>\n<p><!--end rdoc--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cet article d\u00e9crit comment ajouter des p-values sur des ggplots horizontaux en utilisant la fonction R stat_pvalue_manual() disponible dans le package R ggpubr. Les graphiques horizontaux peuvent \u00eatre cr\u00e9\u00e9s en [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16781,"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],"class_list":["post-16784","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faq-fr","tag-ggpubr-fr"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Comment Ajouter des P-Values sur des GGPLOTS Horizontaux - 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-ajouter-des-p-values-sur-des-ggplots-horizontaux\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comment Ajouter des P-Values sur des GGPLOTS Horizontaux - Datanovia\" \/>\n<meta property=\"og:description\" content=\"Cet article d\u00e9crit comment ajouter des p-values sur des ggplots horizontaux en utilisant la fonction R stat_pvalue_manual() disponible dans le package R ggpubr. 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