{"id":2241,"date":"2023-07-23T02:55:11","date_gmt":"2023-07-23T02:55:11","guid":{"rendered":"https:\/\/statorials.org\/pt\/correlacao-policorica-em-r\/"},"modified":"2023-07-23T02:55:11","modified_gmt":"2023-07-23T02:55:11","slug":"correlacao-policorica-em-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/correlacao-policorica-em-r\/","title":{"rendered":"Como calcular a correla\u00e7\u00e3o polic\u00f3rica em r"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><strong>A correla\u00e7\u00e3o polic\u00f3rica<\/strong> \u00e9 usada para calcular a correla\u00e7\u00e3o entre vari\u00e1veis ordinais.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Lembre-se de que vari\u00e1veis ordinais s\u00e3o vari\u00e1veis cujos valores poss\u00edveis s\u00e3o categ\u00f3ricos e possuem ordem natural.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Aqui est\u00e3o alguns exemplos de vari\u00e1veis medidas em uma escala ordinal:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>Satisfa\u00e7\u00e3o<\/strong> : Muito insatisfeito, insatisfeito, neutro, satisfeito, muito satisfeito<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>N\u00edvel de renda<\/strong> : Baixa renda, renda m\u00e9dia, renda alta<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>Status do local de trabalho<\/strong> : Analista de entrada, Analista I, Analista II, Analista S\u00eanior<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>N\u00edvel de dor<\/strong> : quantidade baixa, quantidade m\u00e9dia, quantidade alta<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">O valor da correla\u00e7\u00e3o polic\u00f3rica varia de -1 a 1 onde:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>-1<\/strong> indica correla\u00e7\u00e3o negativa perfeita<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>0<\/strong> indica nenhuma correla\u00e7\u00e3o<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>1<\/strong> indica uma correla\u00e7\u00e3o positiva perfeita<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Podemos usar a fun\u00e7\u00e3o <strong>polychor(x, y)<\/strong> do pacote <strong>polycor<\/strong> para calcular a correla\u00e7\u00e3o polic\u00f3rica entre duas vari\u00e1veis ordinais em R.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Os exemplos a seguir mostram como usar esta fun\u00e7\u00e3o na pr\u00e1tica.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo 1: Calcular Correla\u00e7\u00e3o Polic\u00f3rica para Avalia\u00e7\u00f5es de Filmes<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Digamos que voc\u00ea queira saber se duas ag\u00eancias de classifica\u00e7\u00e3o de filmes diferentes t\u00eam uma alta correla\u00e7\u00e3o entre suas classifica\u00e7\u00f5es de filmes.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Pedimos a cada ag\u00eancia que avalie 20 filmes diferentes numa escala de 1 a 3 onde:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>1<\/strong> indica \u201cruim\u201d<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>2<\/strong> indica \u201cruim\u201d<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>3<\/strong> indica \u201cbom\u201d<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Podemos usar o seguinte c\u00f3digo em R para calcular a correla\u00e7\u00e3o polic\u00f3rica entre os ratings das duas ag\u00eancias:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">library<\/span> (polycor)\n\n<span style=\"color: #008080;\">#define movie ratings for each agency\n<\/span>agency1 &lt;- c(1, 1, 2, 2, 3, 2, 2, 3, 2, 3, 3, 2, 1, 2, 2, 1, 1, 1, 2, 2)\nagency2 &lt;- c(1, 1, 2, 1, 3, 3, 3, 2, 2, 3, 3, 3, 2, 2, 2, 1, 2, 1, 3, 3)\n\n<span style=\"color: #008080;\">#calculate polychoric correlation between ratings\n<\/span>polychor(agency1, agency2)\n\n[1] 0.7828328\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">A correla\u00e7\u00e3o polic\u00f3rica acaba sendo <strong>0,78<\/strong> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">Este valor \u00e9 bastante elevado, indicando que existe uma forte associa\u00e7\u00e3o positiva entre os ratings de cada ag\u00eancia.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo 2: Calcular correla\u00e7\u00e3o polic\u00f3rica para avalia\u00e7\u00f5es de restaurantes<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Digamos que voc\u00ea queira saber se dois restaurantes de bairro diferentes t\u00eam uma correla\u00e7\u00e3o entre as avalia\u00e7\u00f5es dos clientes de seus restaurantes.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Pesquisamos aleatoriamente 20 clientes que comeram nos dois restaurantes e pedimos que avaliassem sua satisfa\u00e7\u00e3o geral em uma escala de 1 a 5, onde:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>1<\/strong> indica \u201cmuito insatisfeito\u201d<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>2<\/strong> indica \u201cinsatisfeito\u201d<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>3<\/strong> indica \u201cneutro\u201d<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>4<\/strong> indica \u201csatisfeito\u201d<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>5<\/strong> indica \u201cmuito satisfeito\u201d<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Podemos usar o seguinte c\u00f3digo em R para calcular a correla\u00e7\u00e3o polic\u00f3rica entre as avalia\u00e7\u00f5es dos dois restaurantes:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">library<\/span> (polycor)\n\n<span style=\"color: #008080;\">#define ratings for each restaurant\n<\/span>restaurant1 &lt;- c(1, 1, 2, 2, 2, 3, 3, 3, 2, 2, 3, 4, 4, 5, 5, 4, 3, 4, 5, 5)\nrestaurant2 &lt;- c(4, 3, 3, 4, 3, 3, 4, 5, 4, 4, 4, 5, 5, 4, 2, 1, 1, 2, 1, 4)\n\n<span style=\"color: #008080;\">#calculate polychoric correlation between ratings\n<\/span>polychor(restaurant1, restaurant2)\n\n[1] -0.1322774\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">A correla\u00e7\u00e3o polic\u00f3rica acaba sendo <strong>-0,13<\/strong> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">Este valor est\u00e1 pr\u00f3ximo de zero, indicando que h\u00e1 muito pouca (ou nenhuma) associa\u00e7\u00e3o entre as classifica\u00e7\u00f5es dos restaurantes.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Os tutoriais a seguir explicam como calcular outros coeficientes de correla\u00e7\u00e3o comuns em R:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/pt\/correlacao-de-lanceiro-em-r\/\" target=\"_blank\" rel=\"noopener\">Como calcular a correla\u00e7\u00e3o de classifica\u00e7\u00e3o de Spearman em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/correlacao-bisserial-pontual-r\/\" target=\"_blank\" rel=\"noopener\">Como calcular a correla\u00e7\u00e3o ponto-bisserial em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/correlacao-cruzada-em-r\/\" target=\"_blank\" rel=\"noopener\">Como calcular a correla\u00e7\u00e3o cruzada em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/correlacao-rolante-em-r\/\" target=\"_blank\" rel=\"noopener\">Como calcular a correla\u00e7\u00e3o deslizante em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/correlacao-parcial-r\/\" target=\"_blank\" rel=\"noopener\">Como calcular a correla\u00e7\u00e3o parcial em R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A correla\u00e7\u00e3o polic\u00f3rica \u00e9 usada para calcular a correla\u00e7\u00e3o entre vari\u00e1veis ordinais. Lembre-se de que vari\u00e1veis ordinais s\u00e3o vari\u00e1veis cujos valores poss\u00edveis s\u00e3o categ\u00f3ricos e possuem ordem natural. Aqui est\u00e3o alguns exemplos de vari\u00e1veis medidas em uma escala ordinal: Satisfa\u00e7\u00e3o : Muito insatisfeito, insatisfeito, neutro, satisfeito, muito satisfeito N\u00edvel de renda : Baixa renda, renda [&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-2241","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 a correla\u00e7\u00e3o polic\u00f3rica em R - Estatologia<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como calcular a correla\u00e7\u00e3o polic\u00f3rica em R, com v\u00e1rios exemplos.\" \/>\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\/correlacao-policorica-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 a correla\u00e7\u00e3o polic\u00f3rica em R - Estatologia\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como calcular a correla\u00e7\u00e3o polic\u00f3rica em R, com v\u00e1rios exemplos.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/correlacao-policorica-em-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-23T02:55:11+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\/correlacao-policorica-em-r\/\",\"url\":\"https:\/\/statorials.org\/pt\/correlacao-policorica-em-r\/\",\"name\":\"Como calcular a correla\u00e7\u00e3o polic\u00f3rica em R - Estatologia\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-23T02:55:11+00:00\",\"dateModified\":\"2023-07-23T02:55:11+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como calcular a correla\u00e7\u00e3o polic\u00f3rica em R, com v\u00e1rios exemplos.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/correlacao-policorica-em-r\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/correlacao-policorica-em-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/correlacao-policorica-em-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como calcular a correla\u00e7\u00e3o polic\u00f3rica 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 a correla\u00e7\u00e3o polic\u00f3rica em R - Estatologia","description":"Este tutorial explica como calcular a correla\u00e7\u00e3o polic\u00f3rica em R, com v\u00e1rios exemplos.","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\/correlacao-policorica-em-r\/","og_locale":"pt_PT","og_type":"article","og_title":"Como calcular a correla\u00e7\u00e3o polic\u00f3rica em R - Estatologia","og_description":"Este tutorial explica como calcular a correla\u00e7\u00e3o polic\u00f3rica em R, com v\u00e1rios exemplos.","og_url":"https:\/\/statorials.org\/pt\/correlacao-policorica-em-r\/","og_site_name":"Statorials","article_published_time":"2023-07-23T02:55:11+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\/correlacao-policorica-em-r\/","url":"https:\/\/statorials.org\/pt\/correlacao-policorica-em-r\/","name":"Como calcular a correla\u00e7\u00e3o polic\u00f3rica em R - Estatologia","isPartOf":{"@id":"https:\/\/statorials.org\/pt\/#website"},"datePublished":"2023-07-23T02:55:11+00:00","dateModified":"2023-07-23T02:55:11+00:00","author":{"@id":"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666"},"description":"Este tutorial explica como calcular a correla\u00e7\u00e3o polic\u00f3rica em R, com v\u00e1rios exemplos.","breadcrumb":{"@id":"https:\/\/statorials.org\/pt\/correlacao-policorica-em-r\/#breadcrumb"},"inLanguage":"pt-PT","potentialAction":[{"@type":"ReadAction","target":["https:\/\/statorials.org\/pt\/correlacao-policorica-em-r\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/statorials.org\/pt\/correlacao-policorica-em-r\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Lar","item":"https:\/\/statorials.org\/pt\/"},{"@type":"ListItem","position":2,"name":"Como calcular a correla\u00e7\u00e3o polic\u00f3rica 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\/2241","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=2241"}],"version-history":[{"count":0,"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/posts\/2241\/revisions"}],"wp:attachment":[{"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/media?parent=2241"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/categories?post=2241"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/tags?post=2241"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}