{"id":286,"date":"2014-09-29T11:31:47","date_gmt":"2014-09-29T09:31:47","guid":{"rendered":"http:\/\/wordpress.callac.online\/index.php\/modification-de-donnees-avec-r\/"},"modified":"2023-10-14T20:14:18","modified_gmt":"2023-10-14T18:14:18","slug":"modification-de-donnees-avec-r","status":"publish","type":"page","link":"https:\/\/wordpress.callac.online\/index.php\/logiciels-mathematiques\/le-logiciel-r\/generalites-sur-r\/modification-de-donnees-avec-r\/","title":{"rendered":"Modification de donn\u00e9es avec R"},"content":{"rendered":"<h2>Un fichier de donn\u00e9es<\/h2>\n<p>Travaillons sur une enqu\u00eate de satisfactions dans un h\u00f4pital, r\u00e9cup\u00e9r\u00e9 lors d&rsquo;un cours de FUN (France Unit\u00e9 Num\u00e9rique). Les fichiers sont disponibles <a href=\"https:\/\/filedn.com\/lpKG7uY9hIHVel5exA5Ik80\/Wordpress\/Logiciels%20math%C3%A9matiques\/R\/\">ici<\/a>.<\/p>\n<p>Par la suite, ces donn\u00e9es seront stock\u00e9es dans la variable <em>satis<\/em> .<\/p>\n<p>Dans ces donn\u00e9es comme souvent, les observations sont en lignes et les variables en colonnes.<\/p>\n<h2>Transformation de variables quantitatives en variables qualitatives<\/h2>\n<p>On utilise la fonction <em>factor<\/em> qui transforme les valeurs num\u00e9riques ordonn\u00e9es en niveaux (<em>levels<\/em>).<\/p>\n<p>Pour cr\u00e9er une nouvelle variable qualitative <em>service.c<\/em> \u00e1 partir de la variable quantitative <em>service<\/em> :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">satis$service.c &lt;- factor(satis$service)\n\n\n<\/pre>\n<p>Pour comparer les deux variables, utilisons la fonction <em>summary<\/em> :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">summary(satis$service)<\/pre>\n<p><code><br \/>\nMin. 1st Qu.  Median    Mean 3rd Qu.    Max.<br \/>\n1.000   3.000   5.000   4.549   7.000   8.000<br \/>\n<\/code><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">summary(satis$service.c)<\/pre>\n<p><code><br \/>\n1  2  3  4  5  6  7  8<br \/>\n65 59 70 69 71 64 67 69<br \/>\n<\/code><\/p>\n<p>On peut par la suite changer les labels des niveaux avec la fonction <em>levels<\/em> :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">levels(satis$service.c)&lt;-c(\"S1\",\"S2\",\"S3\",\"S4\",\"S5\",\"S6\",\"S7\",\"S8\") \nsummary(satis$service.c)<\/pre>\n<p><code><br \/>\nS1 S2 S3 S4 S5 S6 S7 S8<br \/>\n65 59 70 69 71 64 67 69<br \/>\n<\/code><\/p>\n<p>On peut aussi le faire directement.<\/p>\n<p>Pour coder les professions :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">satis$profession.c &lt;- factor(satis$profession,labels=c(\"agriculteur\",\"artisan\",\"cadre\",\"interm\u00e9diaire\",\"employ\u00e9\",\"ouvrier\",\"sans emploi\",\"autre\")) summary(satis$profession.c)<\/pre>\n<p><code><br \/>\nagriculteur       artisan         cadre interm\u00e9diaire       employ\u00e9       ouvrier<br \/>\n1            38           124            88            69            44<br \/>\nsans emploi         autre          NA's<br \/>\n22            41           107<br \/>\n<\/code><\/p>\n<p>Pour coder les sexes :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">satis$sexe.c &lt;- factor(satis$sexe,labels=c(\"homme\",\"femme\")) \nsummary(satis$sexe.c)<\/pre>\n<p><code><br \/>\nhomme femme<br \/>\n268   266<br \/>\n<\/code><\/p>\n<h2>Les changements de valeurs<\/h2>\n<p>L&rsquo;instruction <em>ifelse<\/em> permet d&rsquo;attribuer deux valeurs, en fonction du r\u00e9sultat du test.<\/p>\n<p>Pour transformer la variable <em>recommander<\/em> en variable binaire <em>recommander.b<\/em>, la valeur vaudra 1 est recommander vaut 2 et 0 sinon :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">satis$recommander.b&lt;-ifelse(satis$recommander==2,1,0) \ntable(satis$recommander,satis$recommander.b)<\/pre>\n<p><code><br \/>\n0   1<br \/>\n0  16   0<br \/>\n1 120   0<br \/>\n2   0 269<br \/>\n<\/code><\/p>\n<h2>Destruction d&rsquo;une variable<\/h2>\n<p>Pour d\u00e9truire la variable <em>sexe.c<\/em> :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">satis$sexe.c&lt;-NULL \nsatis$sexe.c<\/pre>\n<p><code><br \/>\nNULL<br \/>\n<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un fichier de donn\u00e9es Travaillons sur une enqu\u00eate de satisfactions dans un h\u00f4pital, r\u00e9cup\u00e9r\u00e9 lors d&rsquo;un cours de FUN (France Unit\u00e9 Num\u00e9rique). Les fichiers sont disponibles ici. Par la suite,&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2074,"menu_order":2,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-286","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Modification de donn\u00e9es avec R - Maths &amp; Num\u00e9rique<\/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:\/\/wordpress.callac.online\/index.php\/logiciels-mathematiques\/le-logiciel-r\/generalites-sur-r\/modification-de-donnees-avec-r\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Modification de donn\u00e9es avec R - Maths &amp; Num\u00e9rique\" \/>\n<meta property=\"og:description\" content=\"Un fichier de donn\u00e9es Travaillons sur une enqu\u00eate de satisfactions dans un h\u00f4pital, r\u00e9cup\u00e9r\u00e9 lors d&rsquo;un cours de FUN (France Unit\u00e9 Num\u00e9rique). 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