{"id":15176,"date":"2020-03-10T07:53:31","date_gmt":"2020-03-10T06:53:31","guid":{"rendered":"https:\/\/www.datanovia.com\/en\/?post_type=dt_lessons&#038;p=15176"},"modified":"2020-03-10T07:53:31","modified_gmt":"2020-03-10T06:53:31","slug":"types-de-test-t","status":"publish","type":"dt_lessons","link":"https:\/\/www.datanovia.com\/en\/fr\/lessons\/types-de-test-t\/","title":{"rendered":"Types de Test-T"},"content":{"rendered":"<div id=\"rdoc\">\n<p>Ce cours d\u00e9crit les diff\u00e9rents <strong>types de test-t<\/strong> pour comparer les moyennes des groupes.<\/p>\n<p>Les types de test-t comprennent:<\/p>\n<ul>\n<li><em>tests-t pour \u00e9chantillon unique<\/em>,<\/li>\n<li><em>Test-t non appari\u00e9<\/em> ou <em>Test-t ind\u00e9pendant<\/em>:\n<ul>\n<li>Test-t de Student et<\/li>\n<li>Le test-t de Welch<\/li>\n<\/ul>\n<\/li>\n<li><em>test-t appari\u00e9<\/em><\/li>\n<\/ul>\n<p>Sommaire:<\/p>\n<div id=\"TOC\">\n<ul>\n<li><a href=\"#test-t-pour-\u00e9chantillon-unique\">Test-t pour \u00e9chantillon unique<\/a><\/li>\n<li><a href=\"#test-t-non-appari\u00e9\">Test-t non appari\u00e9<\/a><\/li>\n<li><a href=\"#test-t-appari\u00e9\">Test-t appari\u00e9<\/a><\/li>\n<li><a href=\"#articles-associ\u00e9s\">Articles associ\u00e9s<\/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\/pratiques-des-statistiques-dans-r-pour-comparaison-de-groupes-variables-numeriques\/' target='_blank'><span class='fa fa-book'><\/span><\/a><\/div><h4><a href='https:\/\/www.datanovia.com\/en\/fr\/produit\/pratiques-des-statistiques-dans-r-pour-comparaison-de-groupes-variables-numeriques\/' target='_blank'> Livre Apparent\u00e9 <\/a><\/h4>Pratique des Statistiques dans R II - Comparaison de Groupes: Variables Num\u00e9riques<\/div>\n<div class='dt-sc-hr-invisible-medium  '><\/div>\n<div id=\"test-t-pour-\u00e9chantillon-unique\" class=\"section level2\">\n<h2>Test-t pour \u00e9chantillon unique<\/h2>\n<p>Le <strong>test t pour \u00e9chantillon unique<\/strong>, \u00e9galement connu sous le nom de <em>test t pour une seule moyenne<\/em> , est utilis\u00e9 pour comparer la moyenne d\u2019un \u00e9chantillon \u00e0 une moyenne standard connue (ou th\u00e9orique \/ hypoth\u00e9tique).<\/p>\n<p>G\u00e9n\u00e9ralement, la moyenne th\u00e9orique provient de:<\/p>\n<ul>\n<li>une exp\u00e9rience pr\u00e9c\u00e9dente. Par exemple, en comparant si le poids moyen des souris diff\u00e8re de 200 mg, une valeur d\u00e9termin\u00e9e dans une \u00e9tude pr\u00e9c\u00e9dente.<\/li>\n<li>ou d\u2019une exp\u00e9rience o\u00f9 vous avez des conditions contr\u00f4les et de traitements. Si vous exprimez vos donn\u00e9es en \u201cpourcentage de contr\u00f4le\u201d, vous pouvez tester si la valeur moyenne de la condition de traitement diff\u00e8re significativement de 100.<\/li>\n<\/ul>\n<\/div>\n<div id=\"test-t-non-appari\u00e9\" class=\"section level2\">\n<h2>Test-t non appari\u00e9<\/h2>\n<p>Le <strong>test-t non appari\u00e9<\/strong> est utilis\u00e9 pour comparer la moyenne de deux groupes ind\u00e9pendants.<\/p>\n<p>Par exemple, vous pourriez vouloir comparer les poids moyens des individus regroup\u00e9s par sexe : les groupes d\u2019hommes et de femmes, qui sont deux groupes non apparent\u00e9s ou ind\u00e9pendants.<\/p>\n<p>Le t-test pour \u00e9chantillons ind\u00e9pendants se pr\u00e9sente sous deux formes diff\u00e9rentes:<\/p>\n<ul>\n<li>le <em>test t standard de Student<\/em>, qui suppose que la variance des deux groupes est \u00e9gale.<\/li>\n<li>le <em>test t de Welch<\/em>, qui est moins restrictif que le test original de Student. Il s\u2019agit du test o\u00f9 vous ne pr\u00e9sumez pas que la variance est la m\u00eame dans les deux groupes, ce qui donne les degr\u00e9s de libert\u00e9 fractionnaires suivants.<\/li>\n<\/ul>\n<p>Les deux m\u00e9thodes donnent des r\u00e9sultats tr\u00e8s semblables, \u00e0 moins que la taille des groupes et les \u00e9carts-types ne soient tr\u00e8s diff\u00e9rents.<\/p>\n<\/div>\n<div id=\"test-t-appari\u00e9\" class=\"section level2\">\n<h2>Test-t appari\u00e9<\/h2>\n<p>Le <strong>test-t appari\u00e9<\/strong> est utilis\u00e9 pour comparer les moyennes de deux groupes d\u2019\u00e9chantillons apparent\u00e9s. En d\u2019autres termes, il est utilis\u00e9 dans une situation o\u00f9 vous avez deux valeurs (c\u2019est-\u00e0-dire une paire de valeurs) pour les m\u00eames \u00e9chantillons.<\/p>\n<p>Par exemple, vous pouvez comparer le poids moyen de 20 souris avant et apr\u00e8s le traitement. Les donn\u00e9es contiennent 20 ensembles de valeurs avant traitement et 20 ensembles de valeurs apr\u00e8s traitement provenant de la double mesure du poids d\u2019une m\u00eame souris. Dans de telles situations, le test t-test par paires peut \u00eatre utilis\u00e9 pour comparer les poids moyens avant et apr\u00e8s le traitement.<\/p>\n<\/div>\n<div id=\"articles-associ\u00e9s\" class=\"section level2\">\n<h2>Articles associ\u00e9s<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.datanovia.com\/en\/fr\/courses\/comparaison-de-deux-moyennes-dans-r\/\">Comparaison des moyennes de deux groupes dans R<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>\n<p><!--end rdoc--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>D\u00e9crit les diff\u00e9rents types de test-t permettant de comparer les moyennes des groupes. Il s&rsquo;agit notamment des tests-t \u00e0 \u00e9chantillon unique, des tests-t non appari\u00e9s et des tests t-appari\u00e9s.<\/p>\n","protected":false},"author":1,"featured_media":15177,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","class_list":["post-15176","dt_lessons","type-dt_lessons","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Types de Test-T : Excellente R\u00e9f\u00e9rence Que Vous Allez Aimez - Datanovia<\/title>\n<meta name=\"description\" content=\"D\u00e9crit les diff\u00e9rents types de test-t permettant de comparer les moyennes des groupes. 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