{"id":913,"date":"2023-07-28T08:12:13","date_gmt":"2023-07-28T08:12:13","guid":{"rendered":"https:\/\/statorials.org\/pt\/correlacao-bisserial-pontual-r\/"},"modified":"2023-07-28T08:12:13","modified_gmt":"2023-07-28T08:12:13","slug":"correlacao-bisserial-pontual-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/correlacao-bisserial-pontual-r\/","title":{"rendered":"Como calcular a correla\u00e7\u00e3o ponto-bisserial em r"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><strong>A correla\u00e7\u00e3o ponto-bisserial<\/strong> \u00e9 usada para medir a rela\u00e7\u00e3o entre uma vari\u00e1vel bin\u00e1ria, x, e uma vari\u00e1vel cont\u00ednua, y.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Semelhante ao <a href=\"https:\/\/statorials.org\/pt\/coeficiente-de-correlacao-de-pearson-1\/\" target=\"_blank\" rel=\"noopener\">coeficiente de correla\u00e7\u00e3o de Pearson<\/a> , o coeficiente de correla\u00e7\u00e3o ponto-bisserial assume um valor entre -1 e 1 onde:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">-1 indica uma correla\u00e7\u00e3o perfeitamente negativa entre duas vari\u00e1veis<\/span><\/li>\n<li> <span style=\"color: #000000;\">0 indica nenhuma correla\u00e7\u00e3o entre duas vari\u00e1veis<\/span><\/li>\n<li> <span style=\"color: #000000;\">1 indica uma correla\u00e7\u00e3o perfeitamente positiva entre duas vari\u00e1veis<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Este tutorial explica como calcular a correla\u00e7\u00e3o ponto-bisserial entre duas vari\u00e1veis em R.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Exemplo: correla\u00e7\u00e3o ponto-bisserial em R<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Suponha que temos uma vari\u00e1vel bin\u00e1ria, x, e uma vari\u00e1vel cont\u00ednua, y:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>x &lt;- c(0, 1, 1, 0, 0, 0, 1, 0, 1, 1, 0)\n\ny &lt;- c(12, 14, 17, 17, 11, 22, 23, 11, 19, 8, 12)\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Podemos usar a fun\u00e7\u00e3o R integrada <strong>cor.test()<\/strong> para calcular a correla\u00e7\u00e3o ponto-bisserial entre as duas vari\u00e1veis:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#calculate point-biserial correlation<\/span>\ncor.test(x, y)\n\n\tPearson's product-moment correlation\n\ndata: x and y\nt = 0.67064, df = 9, p-value = 0.5193\n\nalternative hypothesis: true correlation is not equal to 0\n\n95 percent confidence interval:\n -0.4391885 0.7233704\n\nsample estimates:\n      horn \n0.2181635 \n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Pelo resultado podemos observar o seguinte:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">O coeficiente de correla\u00e7\u00e3o ponto-bisserial \u00e9 <strong>0,218<\/strong><\/span><\/li>\n<li> <span style=\"color: #000000;\">O valor p correspondente \u00e9 <strong>0,5193<\/strong><\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Como o coeficiente de correla\u00e7\u00e3o \u00e9 positivo, isso indica que quando a vari\u00e1vel x assume o valor \u201c1\u201d, a vari\u00e1vel y tende a assumir valores mais elevados do que quando a vari\u00e1vel x assume o valor \u201c0\u201d.<\/span><\/p>\n<p data-slot-rendered-dynamic=\"true\"> <span style=\"color: #000000;\">No entanto, como o valor p desta correla\u00e7\u00e3o n\u00e3o \u00e9 inferior a 0,05, esta correla\u00e7\u00e3o n\u00e3o \u00e9 estatisticamente significativa.<\/span><\/p>\n<p data-slot-rendered-dynamic=\"true\"> <span style=\"color: #000000;\">Observe que o resultado tamb\u00e9m fornece um intervalo de confian\u00e7a de 95% para o verdadeiro coeficiente de correla\u00e7\u00e3o, que \u00e9:<\/span><\/p>\n<p data-slot-rendered-dynamic=\"true\"> <span style=\"color: #000000;\"><strong>IC 95% = (-0,439, 0,723)<\/strong><\/span><\/p>\n<p data-slot-rendered-dynamic=\"true\"> <span style=\"color: #000000;\">Uma vez que este intervalo de confian\u00e7a cont\u00e9m zero, isto fornece mais evid\u00eancias de que o coeficiente de correla\u00e7\u00e3o n\u00e3o \u00e9 estatisticamente significativo.<\/span><\/p>\n<p data-slot-rendered-dynamic=\"true\"> <span style=\"color: #000000;\"><strong>Nota<\/strong> : Voc\u00ea pode encontrar a documenta\u00e7\u00e3o completa da fun\u00e7\u00e3o <strong>cor.test()<\/strong> <a href=\"https:\/\/www.rdocumentation.org\/packages\/stats\/versions\/3.6.2\/topics\/cor.test\" target=\"_blank\" rel=\"noopener\">aqui<\/a> .<\/span><\/p>\n<h2 data-slot-rendered-dynamic=\"true\"> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h2>\n<p data-slot-rendered-dynamic=\"true\"> <span style=\"color: #000000;\">Os tutoriais a seguir explicam como calcular outros coeficientes de correla\u00e7\u00e3o em R:<\/span><\/p>\n<p data-slot-rendered-dynamic=\"true\"> <a href=\"https:\/\/statorials.org\/pt\/correlacao-parcial-r\/\" target=\"_blank\" rel=\"noopener\">Como calcular a correla\u00e7\u00e3o parcial 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-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-policorica-em-r\/\" target=\"_blank\" rel=\"noopener\">Como calcular a correla\u00e7\u00e3o polic\u00f3rica em R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A correla\u00e7\u00e3o ponto-bisserial \u00e9 usada para medir a rela\u00e7\u00e3o entre uma vari\u00e1vel bin\u00e1ria, x, e uma vari\u00e1vel cont\u00ednua, y. Semelhante ao coeficiente de correla\u00e7\u00e3o de Pearson , o coeficiente de correla\u00e7\u00e3o ponto-bisserial assume um valor entre -1 e 1 onde: -1 indica uma correla\u00e7\u00e3o perfeitamente negativa entre duas vari\u00e1veis 0 indica nenhuma correla\u00e7\u00e3o entre duas [&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-913","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 ponto-bisserial em R - Estatologia<\/title>\n<meta name=\"description\" content=\"Uma explica\u00e7\u00e3o simples de como calcular a correla\u00e7\u00e3o ponto-bisserial em R.\" \/>\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-bisserial-pontual-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 ponto-bisserial em R - Estatologia\" \/>\n<meta property=\"og:description\" content=\"Uma explica\u00e7\u00e3o simples de como calcular a correla\u00e7\u00e3o ponto-bisserial em R.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/correlacao-bisserial-pontual-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-28T08:12:13+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-bisserial-pontual-r\/\",\"url\":\"https:\/\/statorials.org\/pt\/correlacao-bisserial-pontual-r\/\",\"name\":\"Como calcular a correla\u00e7\u00e3o ponto-bisserial em R - Estatologia\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-28T08:12:13+00:00\",\"dateModified\":\"2023-07-28T08:12:13+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Uma explica\u00e7\u00e3o simples de como calcular a correla\u00e7\u00e3o ponto-bisserial em R.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/correlacao-bisserial-pontual-r\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/correlacao-bisserial-pontual-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/correlacao-bisserial-pontual-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 ponto-bisserial 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. 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