{"id":4652,"date":"2026-08-12T16:59:07","date_gmt":"2026-08-12T14:59:07","guid":{"rendered":"https:\/\/ellistat.com\/?post_type=guide-dutilisateur&#038;p=4652"},"modified":"2026-08-12T16:59:07","modified_gmt":"2026-08-12T14:59:07","slug":"fact-2-taguchi","status":"publish","type":"guide-dutilisateur","link":"https:\/\/ellistat.com\/it\/guide-dutilisateur\/fact-2-taguchi\/","title":{"rendered":"Fatto 2 Taguchi"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Les plans \u00e0 deux niveaux sont le c\u0153ur historique du plan d\u2019exp\u00e9riences : peu d\u2019essais, effets et interactions estimables, tables standardis\u00e9es et \u00e9prouv\u00e9es.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"644\" height=\"420\" src=\"https:\/\/ellistat.com\/wp-content\/uploads\/doe-taguchi.png\" alt=\"\" class=\"wp-image-4653\" srcset=\"https:\/\/ellistat.com\/wp-content\/uploads\/doe-taguchi.png 644w, https:\/\/ellistat.com\/wp-content\/uploads\/doe-taguchi-300x196.png 300w, https:\/\/ellistat.com\/wp-content\/uploads\/doe-taguchi-18x12.png 18w\" sizes=\"auto, (max-width: 644px) 100vw, 644px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">1. Choisir la table<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Les tables vont de&nbsp;<strong>L4<\/strong>&nbsp;\u00e0&nbsp;<strong>L64<\/strong>, le nombre d\u00e9signant le nombre d\u2019essais. La liste des plans possibles est filtr\u00e9e pour vous : une table dont le nombre de colonnes ne suffit pas \u00e0 porter vos facteurs&nbsp;<strong>e<\/strong>&nbsp;vos interactions d\u00e9clar\u00e9es n\u2019appara\u00eet pas, et la plus petite table valable est propos\u00e9e en t\u00eate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Deux r\u00e8gles de filtrage m\u00e9ritent d\u2019\u00eatre connues :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>d\u00e8s qu\u2019une interaction est d\u00e9clar\u00e9e,\u00a0<strong>L12 et L20 disparaissent<\/strong>\u00a0: ces tables ne portent pas d\u2019interactions estimables ; <\/li>\n\n\n\n<li>certaines structures d\u2019interactions : trois facteurs qui interagissent deux \u00e0 deux, ou deux groupes disjoints, imposent une table plus grande (multiple de 16, voire de 32).<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f La colonne&nbsp;<strong>colonne<\/strong>&nbsp;du tableau des facteurs place chaque facteur sur une colonne pr\u00e9cise de la table. Ce n\u2019est pas cosm\u00e9tique : la colonne d\u00e9termine avec quoi le facteur sera alias\u00e9. Sur un plan sans interaction d\u00e9clar\u00e9e, laissez Ellistat placer ; d\u00e8s qu\u2019il y a des interactions, la table des alias est la seule fa\u00e7on de v\u00e9rifier que le placement vous convient.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. Les trois options<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Option<\/strong><\/td><td><strong>Effet<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>R\u00e9pliquer<\/strong><\/td><td>Double le nombre d\u2019essais pour supprimer les alias. Masqu\u00e9e si la table s\u00e9lectionn\u00e9e est d\u00e9j\u00e0 un plan complet.<\/td><\/tr><tr><td><strong>Quadratique<\/strong><\/td><td>Ajoute un niveau suppl\u00e9mentaire pour \u00e9tudier un effet quadratique, et met un point central.<\/td><\/tr><tr><td><strong>Nb de points centraux<\/strong><\/td><td>Nombre d\u2019essais au centre du domaine.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 \u00ab Quadratique \u00bb transforme un plan \u00e0 deux niveaux en amorce de surface de r\u00e9ponse. C\u2019est le geste \u00e0 faire quand un plan factoriel a livr\u00e9 des effets nets et qu\u2019on soup\u00e7onne un optimum \u00e0 l\u2019int\u00e9rieur du domaine : on ajoute le centre plut\u00f4t que de reconstruire un plan.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. La table des interactions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">C\u2019est un tableau crois\u00e9 des facteurs. Chaque case porte&nbsp;<strong>S\u00ec<\/strong>&nbsp;o&nbsp;<strong>No<\/strong>&nbsp;; un clic bascule. D\u00e9clarer une interaction lui r\u00e9serve une colonne de la table, donc la retire des alias.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sur les tables L12 et L20, la page affiche \u00ab Les interactions n\u2019existent pas sur cette table \u00bb : ces plans sont con\u00e7us pour le criblage et r\u00e9partissent les interactions sur toutes les colonnes.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. La table des alias<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Son titre donne la table retenue et sa r\u00e9solution, par exemple \u00ab alias L16 (R\u00e9solution IV) \u00bb. Trois colonnes :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>colonne<\/strong>\u00a0: le num\u00e9ro de colonne de la table ; <\/li>\n\n\n\n<li><strong>Fattori<\/strong>\u00a0: ce qui y est plac\u00e9 : un facteur, ou une interaction d\u00e9clar\u00e9e not\u00e9e A*B ; <\/li>\n\n\n\n<li><strong>alias<\/strong>\u00a0: les interactions non d\u00e9clar\u00e9es qui tombent sur cette m\u00eame colonne, donc confondues avec ce qui s\u2019y trouve.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f Une colonne qui porte un facteur&nbsp;<strong>e<\/strong>&nbsp;des alias signifie que l\u2019effet mesur\u00e9 sur ce facteur est en r\u00e9alit\u00e9 la somme de son effet propre et de ces interactions. Si l\u2019une d\u2019elles est physiquement plausible, l\u2019effet lu n\u2019est pas interpr\u00e9table tel quel. C\u2019est le moment de r\u00e9pliquer, de passer \u00e0 une table plus grande, ou de d\u00e9clarer l\u2019interaction g\u00eanante.<\/p>","protected":false},"featured_media":0,"menu_order":50,"template":"","meta":{"_acf_changed":true},"menu-guide-dutilisateur":[24],"class_list":["post-4652","guide-dutilisateur","type-guide-dutilisateur","status-publish","hentry","menu-guide-dutilisateur-7-doe-plans-dexperiences"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fact 2 Taguchi - Ellistat<\/title>\n<meta name=\"description\" content=\"Choisissez votre table Taguchi (L4 \u00e0 L64), d\u00e9clarez vos interactions et lisez la table des alias pour construire un plan factoriel fractionnaire fiable.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ellistat.com\/it\/guida-per-lutente\/fact-2-taguchi\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fact 2 Taguchi - 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