{"id":287,"date":"2014-10-02T23:04:36","date_gmt":"2014-10-02T21:04:36","guid":{"rendered":"http:\/\/wordpress.callac.online\/index.php\/etude-dune-variable-quantitative-avec-r\/"},"modified":"2023-10-14T20:14:19","modified_gmt":"2023-10-14T18:14:19","slug":"etude-dune-variable-quantitative-avec-r","status":"publish","type":"page","link":"https:\/\/wordpress.callac.online\/index.php\/logiciels-mathematiques\/le-logiciel-r\/generalites-sur-r\/etude-dune-variable-quantitative-avec-r\/","title":{"rendered":"Etude d&rsquo;une variable quantitative 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>La commande summary<\/h2>\n<p>Cette commande peut s&rsquo;appliquer \u00e0 un tableau de donn\u00e9es (data frame) comme \u00e0 une seule variable.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">summary(satis)<\/pre>\n<p><code><br \/>\nservice           sexe             age          profession    amelioration.sante<br \/>\nMin.   :1.000   Min.   :0.0000   Min.   :18.00   Min.   :1.000   Min.   :0.000<br \/>\n1st Qu.:3.000   1st Qu.:0.0000   1st Qu.:45.00   1st Qu.:3.000   1st Qu.:2.000<br \/>\nMedian :5.000   Median :0.0000   Median :60.00   Median :4.000   Median :2.000<br \/>\nMean   :4.549   Mean   :0.4981   Mean   :58.21   Mean   :4.431   Mean   :2.231<br \/>\n3rd Qu.:7.000   3rd Qu.:1.0000   3rd Qu.:72.00   3rd Qu.:5.500   3rd Qu.:3.000<br \/>\nMax.   :8.000   Max.   :1.0000   Max.   :97.00   Max.   :8.000   Max.   :3.000<br \/>\nNA's   :6       NA's   :107     NA's   :158<br \/>\namelioration.moral  recommander    score.relation  score.information<br \/>\nMin.   :0.000      Min.   :0.000   Min.   :13.00   Min.   :13.00<br \/>\n1st Qu.:1.000      1st Qu.:1.000   1st Qu.:33.00   1st Qu.:28.00<br \/>\nMedian :1.000      Median :2.000   Median :36.00   Median :33.00<br \/>\nMean   :1.679      Mean   :1.625   Mean   :35.22   Mean   :31.91<br \/>\n3rd Qu.:3.000      3rd Qu.:2.000   3rd Qu.:39.00   3rd Qu.:38.00<br \/>\nMax.   :3.000      Max.   :2.000   Max.   :40.00   Max.   :40.00<br \/>\nNA's   :151        NA's   :129     NA's   :185     NA's   :176<br \/>\n<\/code><\/p>\n<p>Pour l&rsquo;\u00e2ge :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">summary(satis$age)<\/pre>\n<p><code><br \/>\nMin. 1st Qu.  Median    Mean 3rd Qu.    Max.    NA's<br \/>\n18.00   45.00   60.00   58.21   72.00   97.00       6<br \/>\n<\/code><\/p>\n<h2>La commande describe<\/h2>\n<p>Cette commande demande charger la librairie <em>prettyR<\/em>.<br \/>\nLe param\u00e8tre <em>num.desc<\/em> prend la liste des param\u00e8tres souhait\u00e9s :<\/p>\n<p>&#8211; <em>mean<\/em> : moyenne<br \/>\n&#8211; <em>sd<\/em> : \u00e9cart-type<br \/>\n&#8211; <em>median<\/em> : m\u00e9diane<br \/>\n&#8211; <em>valid.n<\/em> : nombre de valeurs attribu\u00e9es (non NA)<br \/>\n&#8211; <em>min<\/em> : minimum<br \/>\n&#8211; <em>max<\/em> : maximum<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">library(prettyR)\ndescribe(satis,num.desc=c(\"mean\",\"sd\",\"median\",\"valid.n\",\"min\",\"max\"))<\/pre>\n<p><code><br \/>\nDescription of satis <\/code><\/p>\n<p><code><br \/>\n<\/code><\/p>\n<p><code>Numeric<br \/>\nmean        sd    median   valid.n       min       max<br \/>\nservice                 4.549     2.277         5       534         1         8<br \/>\nsexe                   0.4981    0.5005         0       534         0         1<br \/>\nage                     58.21     17.81        60       528        18        97<br \/>\nprofession              4.431      1.75         4       427         1         8<br \/>\namelioration.sante      2.231    0.7675         2       376         0         3<br \/>\namelioration.moral      1.679     0.951         1       383         0         3<br \/>\nrecommander             1.625    0.5606         2       405         0         2<br \/>\nscore.relation          35.22     4.624        36       349        13        40<br \/>\nscore.information       31.91     6.793        33       358        13        40<br \/>\n<\/code><\/p>\n<p>Les quartiles ne sont pas pr\u00e9vus. On peut les rajouter par la cr\u00e9ation de deux fonctions <em>Q1<\/em> et <em>Q3<\/em> :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">q1&lt;-function(x,na.rm) {\n  return(quantile(x,probs=0.25,na.rm=TRUE,type=1,name=FALSE))\n}\nq3&lt;-function(x,na.rm) {\n  return(quantile(x,probs=0.75,na.rm=TRUE,type=1,name=FALSE))\n}\n<\/pre>\n<p><code><br \/>\nDescription of satis <\/code><\/p>\n<p><code><br \/>\n<\/code><\/p>\n<p><code>Numeric<br \/>\nmin        q1    median        q3       max<br \/>\nservice                     1         3         5         7         8<br \/>\nsexe                        0         0         0         1         1<br \/>\nage                        18        45        60        72        97<br \/>\nprofession                  1         3         4       5.5         8<br \/>\namelioration.sante          0         2         2         3         3<br \/>\namelioration.moral          0         1         1         3         3<br \/>\nrecommander                 0         1         2         2         2<br \/>\nscore.relation             13        33        36        39        40<br \/>\nscore.information          13        28        33        38        40<br \/>\n<\/code><\/p>\n<h2>Les commandes s\u00e9par\u00e9es<\/h2>\n<p>Pour la moyenne :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">mean(satis$age,na.rm=TRUE)<\/pre>\n<p><code><br \/>\n[1] 58.21212<br \/>\n<\/code><\/p>\n<p>Pour la m\u00e9diane :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">median(satis$age,na.rm=TRUE)<\/pre>\n<p><code><br \/>\n[1] 60<br \/>\n<\/code><\/p>\n<p>Pour l&rsquo;\u00e9cart-type :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">sd(satis$age,na.rm=TRUE)<\/pre>\n<p><code><br \/>\n[1] 17.80925<br \/>\n<\/code><\/p>\n<p>Pour Q1 :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">quantile(satis$age,probs=0.25,na.rm=TRUE,type=1,name=FALSE)<\/pre>\n<p><code><br \/>\n25%<br \/>\n45<br \/>\n<\/code><\/p>\n<p>Pour Q3 :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">quantile(satis$age,probs=0.75,na.rm=TRUE,type=1,name=FALSE)<\/pre>\n<p><code><br \/>\n75%<br \/>\n72<br \/>\n<\/code><\/p>\n<p>Pour le minimum :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">min(satis$age,na.rm=TRUE)<\/pre>\n<p><code><br \/>\n[1] 18<br \/>\n<\/code><\/p>\n<p>Pour le maximum :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">max(satis$age,na.rm=TRUE)<\/pre>\n<p><code><br \/>\n[1] 97<br \/>\n<\/code><\/p>\n<p>Pour le nombre de valeurs valides (non NA) :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">valid.n(satis$age)<\/pre>\n<p><code><br \/>\n[1] 528<br \/>\n<\/code><\/p>\n<p>Pour le nombre de valeurs totales :<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">valid.n(satis$age,na.rm=FALSE)<\/pre>\n<p><code><br \/>\n[1] 534<br \/>\n<\/code><\/p>\n<p>NB : la commande <em>valid.n<\/em> fait partie de la librairie <em>prettyR<\/em>.<\/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":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-287","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>Etude d&#039;une variable quantitative 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\/etude-dune-variable-quantitative-avec-r\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Etude d&#039;une variable quantitative 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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