{"id":1547,"date":"2023-07-25T22:42:57","date_gmt":"2023-07-25T22:42:57","guid":{"rendered":"https:\/\/statorials.org\/pt\/tracar-regressao-logistica-em-r\/"},"modified":"2023-07-25T22:42:57","modified_gmt":"2023-07-25T22:42:57","slug":"tracar-regressao-logistica-em-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/tracar-regressao-logistica-em-r\/","title":{"rendered":"Como tra\u00e7ar uma curva de regress\u00e3o log\u00edstica em r"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Muitas vezes voc\u00ea pode querer tra\u00e7ar a curva de um modelo de regress\u00e3o log\u00edstica ajustado em R.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Felizmente, \u00e9 muito f\u00e1cil de fazer e este tutorial explica como faz\u00ea-lo tanto na base R quanto no ggplot2.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo: tra\u00e7ando uma curva de regress\u00e3o log\u00edstica na base R<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como ajustar um modelo de regress\u00e3o log\u00edstica usando vari\u00e1veis do conjunto de dados integrado mtcars em R e, em seguida, como tra\u00e7ar a curva de regress\u00e3o log\u00edstica:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#fit logistic regression model\n<\/span>model &lt;- glm(vs ~ hp, data=mtcars, family=binomial)\n\n<span style=\"color: #008080;\">#define new data frame that contains predictor variable\n<\/span>newdata &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (hp=seq(min(mtcars$hp), max(mtcars$hp),len= <span style=\"color: #008000;\">500<\/span> ))\n\n<span style=\"color: #008080;\">#use fitted model to predict values of vs\n<\/span>newdata$vs = predict(model, newdata, type=\" <span style=\"color: #008000;\">response<\/span> \")\n\n<span style=\"color: #008080;\">#plot logistic regression curve\n<\/span>plot(vs ~hp, data=mtcars, col=\" <span style=\"color: #008000;\">steelblue<\/span> \")\nlines(vs ~ hp, newdata, lwd= <span style=\"color: #008000;\">2<\/span> )\n<\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-15345\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/courbelogistique1.png\" alt=\"Curva de regress\u00e3o log\u00edstica na base R\" width=\"453\" height=\"408\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">O eixo x exibe os valores da vari\u00e1vel preditora <strong>hp<\/strong> e o eixo y exibe a probabilidade prevista da vari\u00e1vel resposta <strong>am<\/strong> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">Podemos ver claramente que valores mais elevados da vari\u00e1vel preditora <strong>hp<\/strong> est\u00e3o associados a probabilidades mais baixas da vari\u00e1vel resposta <strong>vs<\/strong> ser igual a 1.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo: tra\u00e7ando uma curva de regress\u00e3o log\u00edstica em ggplot2<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como ajustar o mesmo modelo de regress\u00e3o log\u00edstica e como tra\u00e7ar a curva de regress\u00e3o log\u00edstica usando a biblioteca de visualiza\u00e7\u00e3o de dados <a href=\"https:\/\/ggplot2.tidyverse.org\/\" target=\"_blank\" rel=\"noopener\">ggplot2<\/a> :<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #993300;\">library<\/span> (ggplot2)<\/span><\/span>\n\n<span style=\"color: #008080;\">#plot logistic regression curve\n<\/span>ggplot(mtcars, <span style=\"color: #3366ff;\">aes<\/span> (x=hp, y=vs)) + \n  geom_point(alpha=.5) +\n  stat_smooth(method=\" <span style=\"color: #008000;\">glm<\/span> \", se=FALSE, method. <span style=\"color: #3366ff;\">args<\/span> = list(family=binomial))<\/strong> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-15346 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/courbelogistique2.png\" alt=\"Curva de regress\u00e3o log\u00edstica em ggplot2\" width=\"422\" height=\"421\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">Observe que esta \u00e9 exatamente a mesma curva produzida no exemplo anterior usando a base R.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Sinta-se \u00e0 vontade para alterar o estilo da curva tamb\u00e9m. Por exemplo, poder\u00edamos transformar a curva em uma linha pontilhada vermelha:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #993300;\">library<\/span> (ggplot2)<\/span><\/span>\n\n<span style=\"color: #008080;\">#plot logistic regression curve\n<\/span>ggplot(mtcars, <span style=\"color: #3366ff;\">aes<\/span> (x=hp, y=vs)) + \n  geom_point(alpha=.5) +\n  stat_smooth(method=\" <span style=\"color: #008000;\">glm<\/span> \", se=FALSE, method. <span style=\"color: #3366ff;\">args<\/span> = list(family=binomial),\n              col=\" <span style=\"color: #008000;\">red<\/span> \", lty= <span style=\"color: #008000;\">2<\/span> )<\/strong> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-15348 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/courbelogistique3.png\" alt=\"\" width=\"403\" height=\"407\" srcset=\"\" sizes=\"auto, \"><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/pt\/regressao-logistica-1\/\" target=\"_blank\" rel=\"noopener\">Introdu\u00e7\u00e3o \u00e0 regress\u00e3o log\u00edstica<\/a><br \/> Como realizar a regress\u00e3o log\u00edstica em R (passo a passo)<br \/> <a href=\"https:\/\/statorials.org\/pt\/regressao-logistica-python\/\" target=\"_blank\" rel=\"noopener\">Como realizar regress\u00e3o log\u00edstica em Python (passo a passo)<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/funcao-seq-em-r\/\" target=\"_blank\" rel=\"noopener\">Como usar a fun\u00e7\u00e3o seq em R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Muitas vezes voc\u00ea pode querer tra\u00e7ar a curva de um modelo de regress\u00e3o log\u00edstica ajustado em R. Felizmente, \u00e9 muito f\u00e1cil de fazer e este tutorial explica como faz\u00ea-lo tanto na base R quanto no ggplot2. Exemplo: tra\u00e7ando uma curva de regress\u00e3o log\u00edstica na base R O c\u00f3digo a seguir mostra como ajustar um modelo [&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-1547","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 tra\u00e7ar uma curva de regress\u00e3o log\u00edstica em R - Estatologia<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como tra\u00e7ar uma curva de regress\u00e3o log\u00edstica na base R e ggplot2, incluindo 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\/tracar-regressao-logistica-em-r\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como tra\u00e7ar uma curva de regress\u00e3o log\u00edstica em R - Estatologia\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como tra\u00e7ar uma curva de regress\u00e3o log\u00edstica na base R e ggplot2, incluindo exemplos.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/tracar-regressao-logistica-em-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-25T22:42:57+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/courbelogistique1.png\" \/>\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\/tracar-regressao-logistica-em-r\/\",\"url\":\"https:\/\/statorials.org\/pt\/tracar-regressao-logistica-em-r\/\",\"name\":\"Como tra\u00e7ar uma curva de regress\u00e3o log\u00edstica em R - Estatologia\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-25T22:42:57+00:00\",\"dateModified\":\"2023-07-25T22:42:57+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como tra\u00e7ar uma curva de regress\u00e3o log\u00edstica na base R e ggplot2, incluindo exemplos.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/tracar-regressao-logistica-em-r\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/tracar-regressao-logistica-em-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/tracar-regressao-logistica-em-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como tra\u00e7ar uma curva de regress\u00e3o log\u00edstica 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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