{"id":4654,"date":"2026-08-12T16:59:16","date_gmt":"2026-08-12T14:59:16","guid":{"rendered":"https:\/\/ellistat.com\/?post_type=guide-dutilisateur&#038;p=4654"},"modified":"2026-08-12T16:59:16","modified_gmt":"2026-08-12T14:59:16","slug":"xn-mixed-level-plans","status":"publish","type":"guide-dutilisateur","link":"https:\/\/ellistat.com\/en\/guide-dutilisateur\/xn-plans-a-niveau-mixtes\/","title":{"rendered":"XN: Mixed-level plans"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Two-level designs impose the same template on all factors. The XN page removes this constraint:\u00a0<strong>Each factor has its own number of levels<\/strong>, which reflects the reality of the industry\u2014three suppliers, two speeds, five tools.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"644\" height=\"372\" src=\"https:\/\/ellistat.com\/wp-content\/uploads\/XN.png\" alt=\"\" class=\"wp-image-4655\" srcset=\"https:\/\/ellistat.com\/wp-content\/uploads\/XN.png 644w, https:\/\/ellistat.com\/wp-content\/uploads\/XN-300x173.png 300w, https:\/\/ellistat.com\/wp-content\/uploads\/XN-18x10.png 18w\" sizes=\"auto, (max-width: 644px) 100vw, 644px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The \u00ab&nbsp;<strong>Maximum number of levels<\/strong>&nbsp;\u00bb (2 to 6) sets the upper limit, and the factor table displays that many columns, N1 \u2026 N<em>n<\/em>. A factor for which you enter only one level is&nbsp;<strong>ignored<\/strong>&nbsp;: It does not vary; there is no effect to estimate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The list of possible layouts adapts to the exact structure of your levels. Depending on the situation:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>fullDOE<\/strong>\u00a0: the full package, all options included. Always offered, five-star, and quickly becomes too expensive; ;<\/li>\n\n\n\n<li> the <strong>fractional tables<\/strong>\u00a0L4, L8, L9, L12, L16, L18, L25, L27, and fractional designs with 12, 16, 18, or 24 trials, depending on the level distribution; ; <\/li>\n\n\n\n<li>the\u00a0<strong>Final Screening Design<\/strong>, when all factors have three levels.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udca1 The XN page is the right solution to a very common need that isn't well met elsewhere: a factor&nbsp;<strong>qualitative with multiple modalities<\/strong>&nbsp;combined with quantitative factors. Whereas Response Surface and Filling reject qualitative data, XN accepts it natively.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f The quality of XN fractional plans varies significantly depending on the table&nbsp;<strong>and<\/strong>&nbsp;The number of factors: The same table may be worth five stars in one configuration and only one star in another. Read the \u201cQuality\u201d column before making your choice, and don\u2019t automatically reuse the table from a previous plan.<\/p>","protected":false},"featured_media":0,"menu_order":60,"template":"","meta":{"_acf_changed":true},"menu-guide-dutilisateur":[24],"class_list":["post-4654","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>XN : plans \u00e0 niveau mixtes - Ellistat<\/title>\n<meta name=\"description\" content=\"M\u00e9langez facteurs qualitatifs et quantitatifs avec des niveaux diff\u00e9rents par facteur : fullDOE, tables fractionnaires L9 \u00e0 L27, ou Definitive Screening Design.\" \/>\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\/en\/users-guide\/xn-mixed-level-plans\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"XN : plans \u00e0 niveau mixtes - 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