{"id":4918,"date":"2026-10-14T15:23:55","date_gmt":"2026-10-14T13:23:55","guid":{"rendered":"https:\/\/ellistat.com\/?post_type=guide-dutilisateur&#038;p=4918"},"modified":"2026-10-14T20:47:56","modified_gmt":"2026-10-14T18:47:56","slug":"tolerance-glossary","status":"publish","type":"guide-dutilisateur","link":"https:\/\/ellistat.com\/en\/guide-dutilisateur\/glossaire-tolerancement\/","title":{"rendered":"Glossary: Tolerances"},"content":{"rendered":"<ul class=\"wp-block-list\">\n<li>Tolerance transfer: Deriving the tolerance to be applied to one characteristic based on the tolerance required for another.<\/li>\n\n\n\n<li>Margin of error: the portion of Y\u2019s tolerance that is set aside to account for what the model does not explain, as well as measurement uncertainty.<\/li>\n\n\n\n<li>Residual standard deviation (S): the dispersion of Y that remains after the effect of X has been removed. This is the price of not knowing the model.<\/li>\n\n\n\n<li>Sensitivity (\u2202Y\/\u2202X): how much Y changes when X changes by one unit. The higher the sensitivity, the tighter the tolerance applied to X.<\/li>\n\n\n\n<li>R\u00b2: the proportion of the variation in Y explained by the model. A high value does not necessarily mean it is sufficient: it is S that determines the tolerance, not R\u00b2.<\/li>\n\n\n\n<li>Worst-case scenario: the arithmetic sum of the deviations, assuming that everything happens simultaneously in the most unfavorable way.<\/li>\n\n\n\n<li>Statistical accumulation: the sum of variances, taking into account the fact that adverse deviations do not all occur at the same time.<\/li>\n\n\n\n<li>Inertia: a single metric combining skewness and dispersion. Maximum inertia gives the supplier the choice between being centered and dispersed, or skewed and concentrated.<\/li>\n\n\n\n<li>Cp \/ Cpk: capability with and without consideration of offset. Cp indicates whether the variation falls within the tolerance, while Cpk indicates whether the production actually does.<\/li>\n\n\n\n<li>Type D model (ISO 22514-2): a model in which the position and dispersion vary from one batch to another. This is the model simulated by the Monte Carlo simulation.<\/li>\n\n\n\n<li>Contribution to variance: the portion of the variability in Y attributable to a factor. It is divided between within-batch variation and between-batch variation.<\/li>\n\n\n\n<li>ppm: number of nonconforming parts per million produced.<\/li>\n\n\n\n<li>Functional requirement: a dimension of the assembled product that must remain within a specified range\u2014clearance, overrun, or center-to-center distance.<\/li>\n\n\n\n<li>Dimension: a dimension to be manufactured that contributes to one or more requirements.<\/li>\n\n\n\n<li>Coefficient \u03b1: how an odds value is factored into a chain\u2014+1 if it is added, \u22121 if it is subtracted.<\/li>\n\n\n\n<li>\u03b2 weighting: the relative weight of a rating in the allocation of the tolerance budget. A difficult rating is assigned a higher \u03b2 value.<\/li>\n\n\n\n<li>Fixed tolerance: a tolerance imposed in advance, which dictates the distribution rather than resulting from it.<\/li>\n\n\n\n<li>Propagated severity: The severity of requirements applied to the dimensions associated with them, in proportion to the budget consumed. It refers to the dimensions to be included in the inspection plan.<\/li>\n\n\n\n<li>Situation: a possible state of the process\u2014off-center positioning and dimensional variation. A point on the compliance triangle represents a situation, not a part.<\/li>\n\n\n\n<li>Exception: A fixed tolerance based on measured values, used to determine whether a batch that falls outside the tolerance range can still be assembled.<\/li>\n\n\n\n<li>Conformance Triangle: The region of the plot (mean, standard deviation) within which the target capability is maintained.<\/li>\n<\/ul>","protected":false},"featured_media":0,"menu_order":0,"template":"","meta":{"_acf_changed":true},"menu-guide-dutilisateur":[42],"class_list":["post-4918","guide-dutilisateur","type-guide-dutilisateur","status-publish","hentry","menu-guide-dutilisateur-9-tolerancement"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Glossaire Tol\u00e9rancement - Ellistat<\/title>\n<meta name=\"description\" content=\"Toutes les d\u00e9finitions des mots clefs du module tol\u00e9rancement de 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\/en\/users-guide\/tolerance-glossary\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Glossaire Tol\u00e9rancement - 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