{"id":4705,"date":"2026-08-13T14:51:29","date_gmt":"2026-08-13T12:51:29","guid":{"rendered":"https:\/\/ellistat.com\/?post_type=guide-dutilisateur&#038;p=4705"},"modified":"2026-08-13T14:51:29","modified_gmt":"2026-08-13T12:51:29","slug":"messages-et-cas-particuliers-7","status":"publish","type":"guide-dutilisateur","link":"https:\/\/ellistat.com\/it\/guide-dutilisateur\/messages-et-cas-particuliers-7\/","title":{"rendered":"Messaggi e casi particolari"},"content":{"rendered":"<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Posizione<\/strong><\/td><td><strong>Causa e soluzione<\/strong><\/td><\/tr><\/thead><tbody><tr><td>\u00ab s\u00e9lectionner un mod\u00e8le \u00bb<\/td><td>Aucun mod\u00e8le dans le projet. Le \u00ab + \u00bb en cr\u00e9e un.<\/td><\/tr><tr><td>La case X d\u2019une colonne est d\u00e9sactiv\u00e9e<\/td><td>Colonne constante, ou de r\u00e9p\u00e9tition sup\u00e9rieure \u00e0 1. Une colonne sans variation n\u2019a pas d\u2019effet estimable.<\/td><\/tr><tr><td>Le processus gaussien n\u2019appara\u00eet pas dans les types<\/td><td>Un X est qualitatif, ou la grille d\u00e9passe 50 lignes.<\/td><\/tr><tr><td>La r\u00e9gression K-OPLS n\u2019appara\u00eet pas<\/td><td>Grille trop volumineuse (plus de 2 000 valeurs sur les colonnes s\u00e9lectionn\u00e9es).<\/td><\/tr><tr><td>Les X et le Y ont disparu du mod\u00e8le<\/td><td>La grille du mod\u00e8le a \u00e9t\u00e9 chang\u00e9e : la s\u00e9lection est remise \u00e0 z\u00e9ro.<\/td><\/tr><tr><td>R\u00b2 excellent mais lignes de test mal pr\u00e9dites<\/td><td>Surajustement. Simplifier le mod\u00e8le ou revenir aux options par d\u00e9faut.<\/td><\/tr><tr><td>\u00ab Aucun terme dans le mod\u00e8le \u00bb<\/td><td>Cocher des termes dans le s\u00e9lecteur de gauche.<\/td><\/tr><tr><td>VIF \u00e9lev\u00e9s sur plusieurs termes<\/td><td>Facteurs redondants : les coefficients ne sont pas s\u00e9parables. Retirer un terme, ou compl\u00e9ter le plan d\u2019essais.<\/td><\/tr><tr><td>L\u2019optimum se place sur une borne du domaine<\/td><td>Le vrai optimum est probablement au-del\u00e0. \u00c9tendre le domaine par de nouveaux essais, ne pas extrapoler.<\/td><\/tr><tr><td>\u00ab Le mod\u00e8le n\u00e9cessite au moins 4 essais mesur\u00e9s \u00bb<\/td><td>Saisir les r\u00e9sultats des premiers essais.<\/td><\/tr><tr><td>\u00ab Saisissez d\u2019abord les r\u00e9sultats des essais en attente \u00bb<\/td><td>Un lot propos\u00e9 n\u2019est pas encore mesur\u00e9.<\/td><\/tr><tr><td>\u00ab Au moins 2 essais mesur\u00e9s sont n\u00e9cessaires \u00bb (convergence)<\/td><td>Normal en d\u00e9but d\u2019\u00e9tude.<\/td><\/tr><tr><td>\u00ab La surface de r\u00e9ponse n\u00e9cessite au moins 2 facteurs \u00bb<\/td><td>La carte exige deux facteurs, le graphique 5D en exige quatre.<\/td><\/tr><tr><td>Couverture inf\u00e9rieure \u00e0 95 % au diagnostic<\/td><td>Le mod\u00e8le sous-estime son incertitude : augmenter le bruit attendu ou ajouter des essais.<\/td><\/tr><tr><td>Avertissement de bruit \u00e9lev\u00e9<\/td><td>V\u00e9rifier la r\u00e9p\u00e9tabilit\u00e9 de la mesure avant de poursuivre.<\/td><\/tr><tr><td>Somme des proportions diff\u00e9rente de 1 (m\u00e9lange)<\/td><td>Corriger l\u2019essai, ou utiliser la commande de correction automatique.<\/td><\/tr><tr><td>Bornes de m\u00e9lange infaisables<\/td><td>Les minimums somment \u00e0 plus de 1, ou les maximums \u00e0 moins de 1. Reprendre les bornes.<\/td><\/tr><\/tbody><\/table><\/figure>","protected":false},"featured_media":0,"menu_order":60,"template":"","meta":{"_acf_changed":true},"menu-guide-dutilisateur":[32],"class_list":["post-4705","guide-dutilisateur","type-guide-dutilisateur","status-publish","hentry","menu-guide-dutilisateur-8-ml-machine-learning"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Messages et cas particuliers - Ellistat<\/title>\n<meta name=\"description\" content=\"Messages d&#039;erreurs et cas particuliers pour le module Machine Learning de Ellistat Data Analysis.\" \/>\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\/messages-et-cas-particuliers-7\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Messages et cas particuliers - 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