{"id":10758,"date":"2019-11-23T09:36:42","date_gmt":"2019-11-23T07:36:42","guid":{"rendered":"https:\/\/www.datanovia.com\/en\/?p=10758"},"modified":"2019-11-23T09:36:42","modified_gmt":"2019-11-23T07:36:42","slug":"comment-tracer-une-ligne-lisse-avec-ggplot2","status":"publish","type":"post","link":"https:\/\/www.datanovia.com\/en\/fr\/blog\/comment-tracer-une-ligne-lisse-avec-ggplot2\/","title":{"rendered":"Comment Tracer une Ligne Lisse avec GGPlot2"},"content":{"rendered":"<div id=\"rdoc\">\n<p>Vous apprendrez comment tracer une <strong>ligne lisse en utilisant ggplot2<\/strong>.<\/p>\n<p>Sommaire:<\/p>\n<div id=\"TOC\">\n<ul>\n<li><a href=\"#prerequis\">Pr\u00e9requis<\/a><\/li>\n<li><a href=\"#fonction-r-cle-geom_smooth\">Fonction R cl\u00e9 : geom_smooth()<\/a><\/li>\n<li><a href=\"#ligne-de-regression\">Ligne de r\u00e9gression<\/a><\/li>\n<li><a href=\"#methode-loess-pour-lajustement-par-regression-locale\">M\u00e9thode Loess pour l\u2019ajustement par r\u00e9gression locale<\/a><\/li>\n<li><a href=\"#interpolation-polynomiale\">Interpolation polynomiale<\/a><\/li>\n<li><a href=\"#interpolation-spline\">Interpolation spline<\/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\/ggplot2-lessentiel-pour-une-visualisation-magnifique-des-donnees-dans-r\/' target='_blank'><span class='fa fa-book'><\/span><\/a><\/div><h4><a href='https:\/\/www.datanovia.com\/en\/fr\/produit\/ggplot2-lessentiel-pour-une-visualisation-magnifique-des-donnees-dans-r\/' target='_blank'> Livre Apparent\u00e9 <\/a><\/h4>GGPLOT2 - L\u2019Essentiel pour une Visualisation Magnifique des Donn\u00e9es dans R<\/div>\n<div class='dt-sc-hr-invisible-medium  '><\/div>\n<div id=\"prerequis\" class=\"section level2\">\n<h2>Pr\u00e9requis<\/h2>\n<ul>\n<li>Chargez le package ggplot2 et mettez le th\u00e8me par d\u00e9faut \u00e0 <code>theme_minimal()<\/code>:<\/li>\n<\/ul>\n<pre class=\"r\"><code>library(ggplot2)\r\ntheme_set(\r\n  theme_bw() +\r\n    theme(legend.position = \"top\")\r\n  )<\/code><\/pre>\n<ul>\n<li>Donn\u00e9es de d\u00e9monstration:<\/li>\n<\/ul>\n<pre class=\"r\"><code>head(cars)<\/code><\/pre>\n<pre><code>##   speed dist\r\n## 1     4    2\r\n## 2     4   10\r\n## 3     7    4\r\n## 4     7   22\r\n## 5     8   16\r\n## 6     9   10<\/code><\/pre>\n<\/div>\n<div id=\"fonction-r-cle-geom_smooth\" class=\"section level2\">\n<h2>Fonction R cl\u00e9 : geom_smooth()<\/h2>\n<ul>\n<li>Fonction cl\u00e9 R : <code>geom_smooth()<\/code> pour ajouter des moyens conditionnels liss\u00e9s \/ ligne de r\u00e9gression.<\/li>\n<li>Arguments cl\u00e9s:\n<ul>\n<li><code>color<\/code>, <code>size<\/code> et <code>linetype<\/code> : Modifier la couleur, la taille et le type de trait.<\/li>\n<li><code>fill<\/code>: Changer la couleur de remplissage de la zone de confiance.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>Un format simplifi\u00e9 de la fonction `geom_smooth():<\/p>\n<pre class=\"r\"><code>geom_smooth(method=\"auto\", se=TRUE, fullrange=FALSE, level=0.95)<\/code><\/pre>\n<div class=\"block\">\n<ul>\n<li><strong>m\u00e9thode<\/strong> : m\u00e9thode de lissage \u00e0 utiliser. Les valeurs possibles sont lm, glm, gam, loess, rlm.\n<ul>\n<li><strong>method = \u201cloess\u201d<\/strong> : C\u2019est la valeur par d\u00e9faut pour un petit nombre d\u2019observations. Il calcule une r\u00e9gression locale liss\u00e9e. Vous pouvez en savoir plus sur <strong>loess<\/strong> en utilisant le code R <strong>?loess<\/strong>.<\/li>\n<li><strong>method =\u201clm\u201d<\/strong> : Il convient \u00e0 un mod\u00e8le <strong>lin\u00e9aire<\/strong>. Notez qu\u2019il est \u00e9galement possible d\u2019indiquer la formule comme <strong>formula = y ~ poly(x, 3)<\/strong> pour sp\u00e9cifier un polyn\u00f4me de degr\u00e9 3.<\/li>\n<\/ul>\n<\/li>\n<li><strong>se<\/strong> : valeur logique. Si TRUE, l\u2019intervalle de confiance s\u2019affiche autour de la courbe liss\u00e9e.<\/li>\n<li><strong>fulllrange<\/strong> : valeur logique. Si TRUE, l\u2019ajustement couvre toute l\u2019\u00e9chelle graphique<\/li>\n<li><strong>level<\/strong> : niveau de l\u2019intervalle de confiance \u00e0 utiliser. La valeur par d\u00e9faut est 0,95<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div id=\"ligne-de-regression\" class=\"section level2\">\n<h2>Ligne de r\u00e9gression<\/h2>\n<p>Pour ajouter une ligne de r\u00e9gression sur un nuage de points, la fonction <code>geom_smooth()<\/code> is used in combination with the argument <code>method = lm<\/code>. <code>lm<\/code> signifie mod\u00e8le lin\u00e9aire.<\/p>\n<pre class=\"r\"><code>p &lt;- ggplot(cars, aes(speed, dist)) +\r\n  geom_point()\r\n# Ajouter une ligne de r\u00e9gression\r\np + geom_smooth(method = lm)\r\n  \r\n# m\u00e9thode loess : ajustement par r\u00e9gression locale\r\np + geom_smooth(method = \"loess\")<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/116-ggplot-smooth-line-regression-line-1.png\" width=\"288\" \/><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/116-ggplot-smooth-line-regression-line-2.png\" width=\"288\" \/><\/p>\n<\/div>\n<div id=\"methode-loess-pour-lajustement-par-regression-locale\" class=\"section level2\">\n<h2>M\u00e9thode Loess pour l\u2019ajustement par r\u00e9gression locale<\/h2>\n<pre class=\"r\"><code># m\u00e9thode loess : ajustement par r\u00e9gression locale\r\np + geom_smooth(method = \"loess\")<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/116-ggplot-smooth-line-loess-local-regression-1.png\" width=\"288\" \/><\/p>\n<\/div>\n<div id=\"interpolation-polynomiale\" class=\"section level2\">\n<h2>Interpolation polynomiale<\/h2>\n<pre class=\"r\"><code># Supprimer la bande de confiance : se = FALSE\r\np + geom_smooth(method = \"lm\", formula = y ~ poly(x, 3), se = FALSE)<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/116-ggplot-smooth-line-polynomial-1.png\" width=\"288\" \/><\/p>\n<\/div>\n<div id=\"interpolation-spline\" class=\"section level2\">\n<h2>Interpolation spline<\/h2>\n<pre class=\"r\"><code>spline.d &lt;- as.data.frame(spline(cars$speed, cars$dist))\r\np + geom_line(data = spline.d, aes(x = x, y = y))<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/116-ggplot-smooth-line-spline-1.png\" width=\"288\" \/><\/p>\n<\/div>\n<\/div>\n<p><!--end rdoc--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Vous apprendrez comment tracer une ligne lisse en utilisant ggplot2. Sommaire: Pr\u00e9requis Fonction R cl\u00e9 : geom_smooth() Ligne de r\u00e9gression M\u00e9thode Loess pour l\u2019ajustement par r\u00e9gression locale Interpolation polynomiale Interpolation [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":10759,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rating_form_position":"","rating_results_position":"","mr_structured_data_type":"","footnotes":""},"categories":[279],"tags":[286],"class_list":["post-10758","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ggplot2-fr","tag-faq-ggplot2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Comment Tracer une Ligne Lisse avec GGPlot2 - Datanovia<\/title>\n<meta name=\"description\" content=\"Cet article d\u00e9crit comment tracer facilement une ligne lisse \u00e0 l&#039;aide du package R ggplot2. 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