{"id":1286,"date":"2023-07-27T00:26:21","date_gmt":"2023-07-27T00:26:21","guid":{"rendered":"https:\/\/statorials.org\/pt\/cramers-v-em-r\/"},"modified":"2023-07-27T00:26:21","modified_gmt":"2023-07-27T00:26:21","slug":"cramers-v-em-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/cramers-v-em-r\/","title":{"rendered":"Como calcular o v de cramer em r"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><strong>O V de Cramer<\/strong> \u00e9 uma medida da for\u00e7a da associa\u00e7\u00e3o entre duas vari\u00e1veis nominais.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Vai de 0 a 1 onde:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>0<\/strong> indica nenhuma associa\u00e7\u00e3o entre as duas vari\u00e1veis.<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>1<\/strong> indica forte associa\u00e7\u00e3o entre as duas vari\u00e1veis.<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">\u00c9 calculado da seguinte forma:<\/span><\/p>\n<p> <strong><span style=\"color: #000000;\">V de Cramer = \u221a <span style=\"border-top: 1px solid black;\">(X <sup>2<\/sup> \/n) \/ min(c-1, r-1)<\/span><\/span><\/strong><\/p>\n<p> <span style=\"color: #000000;\">Ouro:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>X <sup>2<\/sup> :<\/strong> A estat\u00edstica do qui-quadrado<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>n:<\/strong> tamanho total da amostra<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>r:<\/strong> N\u00famero de linhas<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>c:<\/strong> N\u00famero de colunas<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Este tutorial fornece alguns exemplos de c\u00e1lculo do V de Cramer para uma tabela de conting\u00eancia em R.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo 1: V de Cramer para uma mesa 2\u00d72<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como usar a fun\u00e7\u00e3o <strong>CramerV<\/strong> do pacote <strong>rcompanion<\/strong> para calcular o V de Cramer para uma tabela 2&#215;2:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create 2x2 table\n<\/span>data = matrix(c(7,9,12,8), nrow = <span style=\"color: #008000;\">2<\/span> )\n\n<span style=\"color: #008080;\">#view dataset\n<\/span>data\n\n     [,1] [,2]\n[1,] 7 12\n[2,] 9 8\n\n<span style=\"color: #008080;\">#load rcompanion library\n<\/span>library(rcompanion)\n\n<span style=\"color: #008080;\">#calculate Cramer's V\n<\/span>cramerV(data)\n\nCramer V \n  0.1617<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">O V de Cramer \u00e9 <strong>0,1617<\/strong> , o que indica uma associa\u00e7\u00e3o bastante fraca entre as duas vari\u00e1veis na tabela.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Observe que tamb\u00e9m podemos produzir um intervalo de confian\u00e7a para V de Cramer definindo <strong>ci = TRUE<\/strong> :<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>cramerV(data, ci = <span style=\"color: #008000;\">TRUE<\/span> )\n\n  Cramer.V lower.ci upper.ci\n1 0.1617 0.003487 0.4914\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Podemos ver que o V de Cramer permanece inalterado em <strong>0,1617<\/strong> , mas agora temos um intervalo de confian\u00e7a de 95% que cont\u00e9m um intervalo de valores que provavelmente cont\u00e9m o valor verdadeiro do V de Cramer.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Esse intervalo acaba sendo: [ <strong>.003487<\/strong> , <strong>.4914<\/strong> ].<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo 2: V de Cramer para tabelas maiores<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Observe que podemos usar a fun\u00e7\u00e3o <strong>CramerV<\/strong> para calcular o V de Cramer para uma matriz de qualquer tamanho.<\/span><\/p>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como calcular o V de Cramer para uma tabela com 2 linhas e 3 colunas:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create 2x3 table\n<\/span>data = matrix(c(6, 9, 8, 5, 12, 9), nrow = <span style=\"color: #008000;\">2<\/span> )\n\n<span style=\"color: #008080;\">#view dataset\n<\/span>data\n\n     [,1] [,2] [,3]\n[1,] 6 8 12\n[2,] 9 5 9\n\n<span style=\"color: #008080;\">#load rcompanion library\n<\/span>library(rcompanion)\n\n<span style=\"color: #008080;\">#calculate Cramer's V\n<\/span>cramerV(data)\n\nCramer V \n  0.1775<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">O V de Cramer \u00e9 <strong>0,1775<\/strong> .<\/span><\/p>\n<p> <span style=\"color: #000000;\"><em>Voc\u00ea pode encontrar a documenta\u00e7\u00e3o completa da fun\u00e7\u00e3o CramerV <a href=\"https:\/\/www.rdocumentation.org\/packages\/rcompanion\/versions\/2.3.26\/topics\/cramerV\" target=\"_blank\" rel=\"noopener\">aqui<\/a> .<\/em><\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/pt\/teste-de-independencia-do-qui-quadrado-em-r\/\" target=\"_blank\" rel=\"noopener\">Teste qui-quadrado de independ\u00eancia em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/teste-de-qualidade-de-ajuste-qui-quadrado-em-r\/\" target=\"_blank\" rel=\"noopener\">Teste de ajuste qui-quadrado em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/teste-exato-de-pescadores-em-r\/\" target=\"_blank\" rel=\"noopener\">Teste exato de Fisher em R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>O V de Cramer \u00e9 uma medida da for\u00e7a da associa\u00e7\u00e3o entre duas vari\u00e1veis nominais. Vai de 0 a 1 onde: 0 indica nenhuma associa\u00e7\u00e3o entre as duas vari\u00e1veis. 1 indica forte associa\u00e7\u00e3o entre as duas vari\u00e1veis. \u00c9 calculado da seguinte forma: V de Cramer = \u221a (X 2 \/n) \/ min(c-1, r-1) Ouro: X [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-1286","post","type-post","status-publish","format-standard","hentry","category-guia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Como calcular o V de Cramer em R - Estatologia<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como calcular o V de Cramer em R, com um exemplo.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/statorials.org\/pt\/cramers-v-em-r\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como calcular o V de Cramer em R - Estatologia\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como calcular o V de Cramer em R, com um exemplo.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/cramers-v-em-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-27T00:26:21+00:00\" \/>\n<meta name=\"author\" content=\"Dr. benjamim anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dr. benjamim anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pt\/cramers-v-em-r\/\",\"url\":\"https:\/\/statorials.org\/pt\/cramers-v-em-r\/\",\"name\":\"Como calcular o V de Cramer em R - Estatologia\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-27T00:26:21+00:00\",\"dateModified\":\"2023-07-27T00:26:21+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como calcular o V de Cramer em R, com um exemplo.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/cramers-v-em-r\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/cramers-v-em-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/cramers-v-em-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como calcular o v de cramer em r\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/pt\/#website\",\"url\":\"https:\/\/statorials.org\/pt\/\",\"name\":\"Statorials\",\"description\":\"O seu guia para a literacia estat\u00edstica!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/pt\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pt-PT\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\",\"name\":\"Dr. benjamim anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-PT\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Dr. benjamim anderson\"},\"description\":\"Ol\u00e1, sou Benjamin, um professor aposentado de estat\u00edstica que se tornou professor dedicado na Statorials. Com vasta experi\u00eancia e conhecimento na \u00e1rea de estat\u00edstica, estou empenhado em compartilhar meu conhecimento para capacitar os alunos por meio de Statorials. Saber mais\",\"sameAs\":[\"https:\/\/statorials.org\/pt\"]}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Como calcular o V de Cramer em R - Estatologia","description":"Este tutorial explica como calcular o V de Cramer em R, com um exemplo.","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:\/\/statorials.org\/pt\/cramers-v-em-r\/","og_locale":"pt_PT","og_type":"article","og_title":"Como calcular o V de Cramer em R - Estatologia","og_description":"Este tutorial explica como calcular o V de Cramer em R, com um exemplo.","og_url":"https:\/\/statorials.org\/pt\/cramers-v-em-r\/","og_site_name":"Statorials","article_published_time":"2023-07-27T00:26:21+00:00","author":"Dr. benjamim anderson","twitter_card":"summary_large_image","twitter_misc":{"Escrito por":"Dr. benjamim anderson","Tempo estimado de leitura":"2 minutos"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/statorials.org\/pt\/cramers-v-em-r\/","url":"https:\/\/statorials.org\/pt\/cramers-v-em-r\/","name":"Como calcular o V de Cramer em R - Estatologia","isPartOf":{"@id":"https:\/\/statorials.org\/pt\/#website"},"datePublished":"2023-07-27T00:26:21+00:00","dateModified":"2023-07-27T00:26:21+00:00","author":{"@id":"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666"},"description":"Este tutorial explica como calcular o V de Cramer em R, com um exemplo.","breadcrumb":{"@id":"https:\/\/statorials.org\/pt\/cramers-v-em-r\/#breadcrumb"},"inLanguage":"pt-PT","potentialAction":[{"@type":"ReadAction","target":["https:\/\/statorials.org\/pt\/cramers-v-em-r\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/statorials.org\/pt\/cramers-v-em-r\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Lar","item":"https:\/\/statorials.org\/pt\/"},{"@type":"ListItem","position":2,"name":"Como calcular o v de cramer em r"}]},{"@type":"WebSite","@id":"https:\/\/statorials.org\/pt\/#website","url":"https:\/\/statorials.org\/pt\/","name":"Statorials","description":"O seu guia para a literacia estat\u00edstica!","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/statorials.org\/pt\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"pt-PT"},{"@type":"Person","@id":"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666","name":"Dr. benjamim anderson","image":{"@type":"ImageObject","inLanguage":"pt-PT","@id":"https:\/\/statorials.org\/pt\/#\/schema\/person\/image\/","url":"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg","contentUrl":"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg","caption":"Dr. benjamim anderson"},"description":"Ol\u00e1, sou Benjamin, um professor aposentado de estat\u00edstica que se tornou professor dedicado na Statorials. Com vasta experi\u00eancia e conhecimento na \u00e1rea de estat\u00edstica, estou empenhado em compartilhar meu conhecimento para capacitar os alunos por meio de Statorials. Saber mais","sameAs":["https:\/\/statorials.org\/pt"]}]}},"yoast_meta":{"yoast_wpseo_title":"","yoast_wpseo_metadesc":"","yoast_wpseo_canonical":""},"_links":{"self":[{"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/posts\/1286","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/comments?post=1286"}],"version-history":[{"count":0,"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/posts\/1286\/revisions"}],"wp:attachment":[{"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/media?parent=1286"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/categories?post=1286"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/tags?post=1286"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}