{"id":11010,"date":"2016-08-16T13:15:40","date_gmt":"2016-08-16T11:15:40","guid":{"rendered":"http:\/\/www.convertize.com\/fr\/?p=11010"},"modified":"2021-08-02T17:03:59","modified_gmt":"2021-08-02T15:03:59","slug":"le-paradoxe-des-anniversaires","status":"publish","type":"post","link":"https:\/\/www.convertize.com\/fr\/le-paradoxe-des-anniversaires\/","title":{"rendered":"Ce que les Anniversaires Peuvent Vous Apprendre sur le AB Testing"},"content":{"rendered":"<span class=\"rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Temps de lecture : <\/span> <span class=\"rt-time\">3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><p>Il y a 3 ans, nous \u00e9tions 25 employ\u00e9s chez Convertize. Par un amusant hasard, deux membres de l&rsquo;\u00e9quipe \u00e9taient n\u00e9s le 7 Juillet. C&rsquo;\u00e9tait plut\u00f4t exceptionnel d&rsquo;avoir deux coll\u00e8gues avec la m\u00eame date d\u0092e naissance parmi 25 personnes seulement. Nous en avions donc profit\u00e9 pour f\u00eater la chose en allant d\u00eener au restaurant. Mais \u00e9tait-ce vraiment si exceptionnel ? Quel aurait \u00e9t\u00e9 le pourcentage de chances de retrouver ce m\u00eame r\u00e9sultat pour un groupe de 25 personnes tir\u00e9es compl\u00e8tement au hasard, dans la rue par exemple ?<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-11022 aligncenter\" src=\"https:\/\/www.convertize.com\/wp-content\/uploads\/2016\/08\/25people-277x300.png\" alt=\"Birthday-paradox\" width=\"277\" height=\"300\" \/><\/p>\n<p>&nbsp;<\/p>\n<h3><strong>Un r\u00e9sultat statistique tr\u00e8s surprenant&#8230;<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Ce probl\u00e8me semble simple, et pourtant <\/span><b>beaucoup se trompent<\/b><span style=\"font-weight: 400;\">&#8230;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">D&rsquo;apr\u00e8s vous, sachant qu&rsquo;il y a 365 jours dans une ann\u00e9e (on exceptera les ann\u00e9es bissextiles), combien y a-t-il de chances d&rsquo;avoir deux personnes n\u00e9es le m\u00eame jour dans un groupe de 25 individus ? <\/span><\/p>\n<section class=\"box-ball\">\n<ul>\n<li><span style=\"font-weight: 400;\">1 chance sur 365 donc environ 0,3% ? <\/span><\/li>\n<li><span style=\"line-height: 1.5;\">2 chances sur 365 donc environ 0,5% ?<\/span><\/li>\n<li><span style=\"line-height: 1.5;\">25 chances sur 365 donc environ 7% ?<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<\/section>\n<p><span style=\"font-weight: 400;\">Tenez-vous bien ! La probabilit\u00e9 de trouver deux personnes ayant la m\u00eame date d&rsquo;anniversaire dans un groupe de 25 personnes tir\u00e9es al\u00e9atoirement est de pr\u00e8s de 56%. <\/span><b>Soit plus d&rsquo;une chance sur deux<\/b><span style=\"font-weight: 400;\">. Oui oui. Et ce chiffre monte jusqu&rsquo;\u00e0 pr\u00e8s de 90% pour un groupe de 40 personnes ! Ce qui est r\u00e9ellement exceptionnel est, au contraire, de ne pas trouver deux personnes n\u00e9es le m\u00eame jour. <\/span><b>\u00c9tonnant, non ?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Ces r\u00e9sultats sont empriques et incontestables, <\/span><a href=\"https:\/\/fr.wikipedia.org\/wiki\/Paradoxe_des_anniversaires\"><span style=\"font-weight: 400;\">retrouvables par un rapide calcul<\/span><\/a><span style=\"font-weight: 400;\">, et v\u00e9rifi\u00e9s dans la r\u00e9alit\u00e9. Faites le test ! Regardez au bureau, dans votre entourage, dans les classes de vos enfants, vous trouverez plus de personnes n\u00e9es le m\u00eame jour que ce que vous pensez.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-11017\" src=\"https:\/\/www.convertize.com\/wp-content\/uploads\/2016\/08\/720px-Paradoxe_anniversaire.svg_.png\" alt=\"Paradoxe_anniversaire\" width=\"500\" height=\"375\" \/><\/p>\n<p style=\"text-align: center;\"><span style=\"text-decoration: underline;\"><strong>En rouge la probabilit\u00e9 de trouver deux individus ayant la m\u00eame date d&rsquo;anniversaire, en fonction du nombre de personnes dans le groupe<\/strong><\/span><\/p>\n<p>&nbsp;<\/p>\n<h3>AB Testing et Significativit\u00e9 : Laissez-vous aider !<\/h3>\n<p>Soyez donc tr\u00e8s prudents avec les statistiques, ce n&rsquo;est pas intuitif. Si un chiffre vous parait exceptionnel, il est peut \u00eatre en r\u00e9alit\u00e9 tout \u00e0 fait habituel : il en est de m\u00eame en optimisation des conversions. Ne tirez pas de conclusions h\u00e2tives concernant vos donn\u00e9es !<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Il y a deux mois, un client m&rsquo;a demand\u00e9 pourquoi on ne mettait pas en place une version de son site qui avait amen\u00e9 20 conversions de plus que la version originale au cours de la premi\u00e8re semaine d&rsquo;un AB test. Je lui ai expliqu\u00e9 qu&rsquo;au vu des autres donn\u00e9es <\/span><i><span style=\"font-weight: 400;\">(traffic sur la semaine : 10000 visiteurs uniques, taux de conversion de la version originale : 10%)<\/span><\/i><span style=\"font-weight: 400;\"> ces 20 conversions n&rsquo;avaient rien d&rsquo;\u00e9tonnant, et ne nous donnaient pas d&rsquo;information sur la r\u00e9elle performance de la variation. \u00a0En effet, trouver ce genre de diff\u00e9rence par hasard est parfaitement habituel, tout comme trouver par hasard deux personnes n\u00e9es le m\u00eame jour dans un groupe de 25 individus est parfaitement habituel. Il aurait donc \u00e9tait mal avis\u00e9 de conclure que la variation \u00e9tait meilleure que l&rsquo;originale.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Dans ce genre de situations, ne vous risquez pas aux statistiques, il est si facile de se tromper. Si vous essayez de vous auto-former en vous renseignant sur internet, vous risquez de vous emm\u00ealer dans de nombreux concepts et sources contradictoires. Laissez vous plut\u00f4t guider ! <a href=\"https:\/\/www.convertize.com\/?\"><strong>Convertize<\/strong><\/a> (nouvelle solution actuellement accessible sur invitation) permet par exemple de valider \u00a0automatiquement la dur\u00e9e et la significativit\u00e9 de vos tests, sans que vous ayez besoin d&rsquo;interpr\u00e9ter vos r\u00e9sultats. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Mais si vous adorez les statistiques, vous pouvez aussi utiliser <\/span><span style=\"font-weight: 400;\">abtesting.ninja<\/span><span style=\"font-weight: 400;\"> pour calculer la significativit\u00e9 de vos A\/B tests.<\/span><\/p>\n<div class=\"social-btn\"><a class=\"col-1 sbtn s-twitter\" onclick=\"popupwindow('https:\/\/twitter.com\/intent\/tweet?text=Ce%20que%20les%20Anniversaires%20Peuvent%20Vous%20Apprendre%20sur%20le%20AB%20Testing&amp;url=https%3A%2F%2Fwww.convertize.com%2Ffr%2Fle-paradoxe-des-anniversaires%2F&amp;via=convertize','Twitter Follow','600','600')\" href=\"javascript:void(0);\" target=\"_blank\" rel=\"nofollow\"><span>Share on Twitter<\/span><\/a><a class=\"col-1 sbtn s-facebook\" onclick=\"popupwindow('https:\/\/www.facebook.com\/sharer\/sharer.php?u=https%3A%2F%2Fwww.convertize.com%2Ffr%2Fle-paradoxe-des-anniversaires%2F','Facebook Follow','600','600')\" href=\"javascript:void(0);\" target=\"_blank\" rel=\"nofollow\"><span>Share on Facebook<\/span><\/a><a class=\"col-1 sbtn s-linkedin\" onclick=\"popupwindow('https:\/\/www.linkedin.com\/shareArticle?mini=true&url=https%3A%2F%2Fwww.convertize.com%2Ffr%2Fle-paradoxe-des-anniversaires%2F&amp;title=Ce%20que%20les%20Anniversaires%20Peuvent%20Vous%20Apprendre%20sur%20le%20AB%20Testing&amp;description=','Linkedin Follow','600','600')\" href=\"javascript:void(0);\" target=\"_blank\" rel=\"nofollow\"><span>Share on Linkedin<\/span><\/a><\/div>","protected":false},"excerpt":{"rendered":"<p><span class=\"rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Temps de lecture : <\/span> <span class=\"rt-time\">3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span> Il y a 3 ans, nous \u00e9tions 25 employ\u00e9s chez Convertize. Par un amusant hasard, deux membres de l&rsquo;\u00e9quipe \u00e9taient n\u00e9s le 7 Juillet. C&rsquo;\u00e9tait plut\u00f4t exceptionnel d&rsquo;avoir deux coll\u00e8gues avec la m\u00eame date d\u0092e naissance parmi 25 personnes seulement. Nous en avions donc profit\u00e9 pour f\u00eater la chose en allant d\u00eener au restaurant. Mais [&hellip;]<\/p>\n","protected":false},"author":19,"featured_media":19692,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[373],"tags":[],"class_list":{"0":"post-11010","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-conseils-ab-testing","8":"entry"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ce que les Anniversaires Peuvent Vous Apprendre sur le AB Testing<\/title>\n<meta name=\"description\" content=\"%\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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