{"id":4630,"date":"2026-08-12T15:45:45","date_gmt":"2026-08-12T13:45:45","guid":{"rendered":"https:\/\/ellistat.com\/?post_type=guide-dutilisateur&p=4630"},"modified":"2026-08-12T15:45:45","modified_gmt":"2026-08-12T13:45:45","slug":"attribute-control-charts","status":"publish","type":"guide-dutilisateur","link":"https:\/\/ellistat.com\/en\/guide-dutilisateur\/cartes-de-controle-aux-attributs\/","title":{"rendered":"Attribute Control Charts"},"content":{"rendered":"

When you\u2019re not taking measurements but counting\u2014such as defective parts or the number of defects\u2014the measurement card no longer applies. Six cards are available:<\/p>\n\n\n\n

Map<\/strong><\/td>Let's follow along<\/strong><\/td>Lot Size<\/strong><\/td><\/tr><\/thead>
p<\/strong><\/td>The percentage of defective parts<\/td>variable or fixed<\/td><\/tr>
No problem<\/strong><\/td>The number of defective parts<\/td>fixed<\/td><\/tr>
c<\/strong><\/td>The number of defects<\/td>fixed<\/td><\/tr>
u<\/strong><\/td>The number of defects per unit<\/td>variable or fixed<\/td><\/tr>
P'Laney<\/strong><\/td>A proportion, in the presence of overdispersion<\/td>variable<\/td><\/tr>
U\u2019Laney<\/strong><\/td>Number of defects per unit, in the presence of overdispersion<\/td>variable<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Defective part or number of defects?<\/strong>\u00a0<\/h3>\n\n\n\n

A part may have three defects: it counts as one defective part (cards p and Np) but as three defects (cards c and u). The choice depends on the decision to be made.<\/p>\n\n\n\n

Laney's Maps<\/strong>\u00a0<\/h3>\n\n\n\n

They address a specific situation: with large batches, the standard limits become so tight that almost all data points fall outside them. It is not the process that is out of control; rather, the binomial or Poisson model is too optimistic, and there is additional variation between batches. The P\u2019 and U\u2019 charts take this into account.<\/p>\n\n\n\n

Settings:<\/h2>\n\n\n\n
    \n
  • Map Selection<\/strong>\u00a0and\u00a0batch size<\/strong>\u00a0(fixed or dedicated column); ;<\/li>\n\n\n\n
  • Phase I (observation zone)<\/strong>, with a\u00a0beginning<\/strong>\u00a0and a\u00a0end<\/strong>\u00a0: the reference period used to establish the limits. The following points are evaluated relative to this period; ;<\/li>\n\n\n\n
  • Historical Average<\/strong>\u00a0to use a known reference value rather than recalculating it; ;<\/li>\n\n\n\n
  • Center the control chart<\/strong>, the\u00a0X-axis labels<\/strong>, and the same uncontrolled rules as on the measurement cards.<\/li>\n<\/ul>\n\n\n\n
    \n

    \ud83d\udca1 Define Phase I over a period of time well-managed and representative<\/strong>. Setting boundaries during a turbulent period amounts to accepting chaos as normal.<\/p>\n<\/blockquote>\n\n\n\n

    \"\"<\/figure>","protected":false},"featured_media":0,"menu_order":50,"template":"","meta":{"_acf_changed":true},"menu-guide-dutilisateur":[22],"class_list":["post-4630","guide-dutilisateur","type-guide-dutilisateur","status-publish","hentry","menu-guide-dutilisateur-4-statistiques-descriptives"],"acf":[],"yoast_head":"\nCartes de contr\u00f4le aux attributs - Ellistat<\/title>\n<meta name=\"description\" content=\"Suivez vos d\u00e9fauts et pi\u00e8ces d\u00e9fectueuses avec les cartes p, np, c, u ou les cartes de Laney en cas de sur-dispersion. Guide complet de r\u00e9glage et de choix.\" \/>\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\/attribute-control-charts\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cartes de contr\u00f4le aux attributs - Ellistat\" \/>\n<meta property=\"og:description\" content=\"Suivez vos d\u00e9fauts et pi\u00e8ces d\u00e9fectueuses avec les cartes p, np, c, u ou les cartes de Laney en cas de sur-dispersion. Guide complet de r\u00e9glage et de choix.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ellistat.com\/en\/users-guide\/attribute-control-charts\/\" \/>\n<meta property=\"og:site_name\" content=\"Ellistat\" \/>\n<meta property=\"og:image\" content=\"https:\/\/ellistat.com\/wp-content\/uploads\/cartes-attributs.png\" \/>\n\t<meta property=\"og:image:width\" content=\"964\" \/>\n\t<meta property=\"og:image:height\" content=\"520\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/ellistat.com\\\/guide-dutilisateur\\\/cartes-de-controle-aux-attributs\\\/\",\"url\":\"https:\\\/\\\/ellistat.com\\\/guide-dutilisateur\\\/cartes-de-controle-aux-attributs\\\/\",\"name\":\"Cartes de contr\u00f4le aux attributs - Ellistat\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/ellistat.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/ellistat.com\\\/guide-dutilisateur\\\/cartes-de-controle-aux-attributs\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/ellistat.com\\\/guide-dutilisateur\\\/cartes-de-controle-aux-attributs\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/ellistat.com\\\/wp-content\\\/uploads\\\/cartes-attributs.png\",\"datePublished\":\"2026-08-12T13:45:45+00:00\",\"description\":\"Suivez vos d\u00e9fauts et pi\u00e8ces d\u00e9fectueuses avec les cartes p, np, c, u ou les cartes de Laney en cas de sur-dispersion. Guide complet de r\u00e9glage et de choix.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/ellistat.com\\\/guide-dutilisateur\\\/cartes-de-controle-aux-attributs\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/ellistat.com\\\/guide-dutilisateur\\\/cartes-de-controle-aux-attributs\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/ellistat.com\\\/guide-dutilisateur\\\/cartes-de-controle-aux-attributs\\\/#primaryimage\",\"url\":\"https:\\\/\\\/ellistat.com\\\/wp-content\\\/uploads\\\/cartes-attributs.png\",\"contentUrl\":\"https:\\\/\\\/ellistat.com\\\/wp-content\\\/uploads\\\/cartes-attributs.png\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/ellistat.com\\\/guide-dutilisateur\\\/cartes-de-controle-aux-attributs\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\\\/\\\/ellistat.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Cartes de contr\u00f4le aux attributs\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/ellistat.com\\\/#website\",\"url\":\"https:\\\/\\\/ellistat.com\\\/\",\"name\":\"Ellistat\",\"description\":\"La suite qualit\u00e9 de l'industrie m\u00e9canique\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/ellistat.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Attribute Control Charts - Ellistat","description":"Track your defects and defective parts using p, np, c, or u cards, or Laney cards in cases of overspill. Comprehensive guide to setup and selection.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/ellistat.com\/en\/users-guide\/attribute-control-charts\/","og_locale":"en_US","og_type":"article","og_title":"Cartes de contr\u00f4le aux attributs - Ellistat","og_description":"Suivez vos d\u00e9fauts et pi\u00e8ces d\u00e9fectueuses avec les cartes p, np, c, u ou les cartes de Laney en cas de sur-dispersion. Guide complet de r\u00e9glage et de choix.","og_url":"https:\/\/ellistat.com\/en\/users-guide\/attribute-control-charts\/","og_site_name":"Ellistat","og_image":[{"width":964,"height":520,"url":"https:\/\/ellistat.com\/wp-content\/uploads\/cartes-attributs.png","type":"image\/png"}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/ellistat.com\/guide-dutilisateur\/cartes-de-controle-aux-attributs\/","url":"https:\/\/ellistat.com\/guide-dutilisateur\/cartes-de-controle-aux-attributs\/","name":"Attribute Control Charts - Ellistat","isPartOf":{"@id":"https:\/\/ellistat.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/ellistat.com\/guide-dutilisateur\/cartes-de-controle-aux-attributs\/#primaryimage"},"image":{"@id":"https:\/\/ellistat.com\/guide-dutilisateur\/cartes-de-controle-aux-attributs\/#primaryimage"},"thumbnailUrl":"https:\/\/ellistat.com\/wp-content\/uploads\/cartes-attributs.png","datePublished":"2026-08-12T13:45:45+00:00","description":"Track your defects and defective parts using p, np, c, or u cards, or Laney cards in cases of overspill. Comprehensive guide to setup and selection.","breadcrumb":{"@id":"https:\/\/ellistat.com\/guide-dutilisateur\/cartes-de-controle-aux-attributs\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/ellistat.com\/guide-dutilisateur\/cartes-de-controle-aux-attributs\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/ellistat.com\/guide-dutilisateur\/cartes-de-controle-aux-attributs\/#primaryimage","url":"https:\/\/ellistat.com\/wp-content\/uploads\/cartes-attributs.png","contentUrl":"https:\/\/ellistat.com\/wp-content\/uploads\/cartes-attributs.png"},{"@type":"BreadcrumbList","@id":"https:\/\/ellistat.com\/guide-dutilisateur\/cartes-de-controle-aux-attributs\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Accueil","item":"https:\/\/ellistat.com\/"},{"@type":"ListItem","position":2,"name":"Cartes de contr\u00f4le aux attributs"}]},{"@type":"WebSite","@id":"https:\/\/ellistat.com\/#website","url":"https:\/\/ellistat.com\/","name":"Ellistat","description":"The quality suite for the mechanical engineering industry","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/ellistat.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/ellistat.com\/en\/wp-json\/wp\/v2\/guide-dutilisateur\/4630","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ellistat.com\/en\/wp-json\/wp\/v2\/guide-dutilisateur"}],"about":[{"href":"https:\/\/ellistat.com\/en\/wp-json\/wp\/v2\/types\/guide-dutilisateur"}],"wp:attachment":[{"href":"https:\/\/ellistat.com\/en\/wp-json\/wp\/v2\/media?parent=4630"}],"wp:term":[{"taxonomy":"menu-guide-dutilisateur","embeddable":true,"href":"https:\/\/ellistat.com\/en\/wp-json\/wp\/v2\/menu-guide-dutilisateur?post=4630"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}