{"id":1861,"date":"2012-07-30T08:29:13","date_gmt":"2012-07-30T07:29:13","guid":{"rendered":"https:\/\/abcdr.guyader.pro\/?p=1861"},"modified":"2018-04-08T00:00:52","modified_gmt":"2018-04-07T23:00:52","slug":"comment-calculer-une-moyenne-par-groupe-avec-r-ave","status":"publish","type":"post","link":"https:\/\/thinkr.fr\/abcdr\/comment-calculer-une-moyenne-par-groupe-avec-r-ave\/","title":{"rendered":"Comment calculer une moyenne par groupe avec R ? ave"},"content":{"rendered":"<p>Je viens de d\u00e9couvrir la fonction<strong> ave<\/strong>.. il s&rsquo;agit d&rsquo;une fonction<strong> extremement rapide<\/strong> qui permet de calculer une moyenne (ou autre chose..) par groupe. elle est tr\u00e9s efficace par rapport \u00e0 des combinaisons de <strong>by<\/strong> et autres <strong>do.call<\/strong><\/p>\n<pre><code><br \/><br \/># mettons nous dans un cas ou nous voulons calculer le score moyenne des hommes d'une part , et des femme d'autre part<br \/> data&lt;-data.frame(cbind(c(rep(\"homme\",4),rep(\"femme\",5)),c(1:4,3:7)))<br \/>names(data)&lt;-c(\"genre\",\"score\")<br \/>data$score&lt;-as.numeric(data$score)<br \/>data<br \/>attach(data)<br \/>cbind(data,ave(score,genre)) <br \/><br \/><\/code><\/pre>\n<p>L&rsquo;efficacit\u00e9 d&rsquo;<strong>ave<\/strong> se retrouve surtout sur les tres gos jeux de donn\u00e9es&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Je viens de d\u00e9couvrir la fonction ave.. il s&rsquo;agit d&rsquo;une fonction extremement rapide qui permet de calculer une moyenne (ou autre chose..) par groupe. elle est tr\u00e9s efficace par rapport \u00e0 des combinaisons de by et autres do.call # mettons nous dans un cas ou nous voulons calculer le score moyenne des hommes d&rsquo;une part , et des femme d&rsquo;autre part data&lt;-data.frame(cbind(c(rep(\u00ab\u00a0homme\u00a0\u00bb,4),rep(\u00ab\u00a0femme\u00a0\u00bb,5)),c(1:4,3:7)))names(data)&lt;-c(\u00ab\u00a0genre\u00a0\u00bb,\u00a0\u00bbscore\u00a0\u00bb)data$score&lt;-as.numeric(data$score)dataattach(data)cbind(data,ave(score,genre)) L&rsquo;efficacit\u00e9 d&rsquo;ave se retrouve surtout sur les tres gos jeux de donn\u00e9es&#8230;<a class=\"more-link\" href=\"https:\/\/thinkr.fr\/abcdr\/comment-calculer-une-moyenne-par-groupe-avec-r-ave\/\">Read More &rarr;<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":{"twitter_399453572_399453572":""},"rop_publish_now_history":[],"rop_publish_now_status":"pending","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[8,12],"tags":[],"class_list":{"0":"entry","1":"post","2":"publish","3":"author-vincent","4":"post-1861","6":"format-standard","7":"category-fonctions-utiles","8":"category-manipulation-de-donnees"},"acf":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p9O7Sx-u1","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts\/1861","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/comments?post=1861"}],"version-history":[{"count":2,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts\/1861\/revisions"}],"predecessor-version":[{"id":4218,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts\/1861\/revisions\/4218"}],"wp:attachment":[{"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/media?parent=1861"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/categories?post=1861"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/tags?post=1861"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}