{"id":2712,"date":"2023-07-21T01:34:05","date_gmt":"2023-07-21T01:34:05","guid":{"rendered":"https:\/\/statorials.org\/pt\/interpretar-a-saida-de-regressao-logistica-prz-r\/"},"modified":"2023-07-21T01:34:05","modified_gmt":"2023-07-21T01:34:05","slug":"interpretar-a-saida-de-regressao-logistica-prz-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/interpretar-a-saida-de-regressao-logistica-prz-r\/","title":{"rendered":"Como interpretar pr(&gt;|z|) na sa\u00edda de regress\u00e3o log\u00edstica em r"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Sempre que voc\u00ea realizar uma regress\u00e3o log\u00edstica em R, a sa\u00edda do seu modelo de regress\u00e3o ser\u00e1 exibida no seguinte formato:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\">Coefficients:\n              Estimate Std. Error z value Pr(&gt;|z|)  \n(Intercept) -17.638452 9.165482 -1.924 0.0543 .\navailable -0.004153 0.006621 -0.627 0.5305  \ndrat 4.879396 2.268115 2.151 0.0315 * \n<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">A coluna <strong>Pr(&gt;|z|)<\/strong> representa o valor p associado ao valor na coluna <strong>do valor z<\/strong> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">Se o valor p estiver abaixo de um certo n\u00edvel de signific\u00e2ncia (por exemplo, \u03b1 = 0,05), isso indica que a vari\u00e1vel preditora tem uma rela\u00e7\u00e3o estatisticamente significativa com a <a href=\"https:\/\/statorials.org\/pt\/respostas-explicativas-das-variaveis\/\" target=\"_blank\" rel=\"noopener\">vari\u00e1vel resposta<\/a> no modelo.<\/span><\/p>\n<p> <span style=\"color: #000000;\">O exemplo a seguir mostra como interpretar os valores da coluna Pr(&gt;|z|) para um modelo de regress\u00e3o log\u00edstica na pr\u00e1tica.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo: Como interpretar valores Pr(&gt;|z|)<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como ajustar um <a href=\"https:\/\/statorials.org\/pt\/regressao-logistica-1\/\" target=\"_blank\" rel=\"noopener\">modelo de regress\u00e3o log\u00edstica<\/a> em R usando o conjunto de dados integrado <strong>mtcars<\/strong> :<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008080;\">#fit logistic regression model\n<\/span>model &lt;- glm(am ~ disp + drat, data=mtcars, family=binomial)\n\n<span style=\"color: #008080;\">#view model summary\n<\/span>summary(model)\n\nCall:\nglm(formula = am ~ disp + drat, family = binomial, data = mtcars)\n\nDeviance Residuals: \n    Min 1Q Median 3Q Max  \n-1.5773 -0.2273 -0.1155 0.5196 1.8957  \n\nCoefficients:\n              Estimate Std. Error z value Pr(&gt;|z|)  \n(Intercept) -17.638452 9.165482 -1.924 0.0543 .\navailable -0.004153 0.006621 -0.627 0.5305  \ndrat 4.879396 2.268115 2.151 0.0315 *\n---\nSignificant. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1\n\n(Dispersion parameter for binomial family taken to be 1)\n\n    Null deviance: 43,230 on 31 degrees of freedom\nResidual deviance: 21,268 on 29 degrees of freedom\nAIC: 27,268\n\nNumber of Fisher Scoring iterations: 6<\/strong><\/span><\/pre>\n<p> <span style=\"color: #000000;\">Veja como interpretar os valores na coluna Pr(&gt;|z|):<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">O valor p para a vari\u00e1vel preditora \u201cdisp\u201d \u00e9 <strong>0,5305<\/strong> . Como esse valor n\u00e3o \u00e9 inferior a 0,05, n\u00e3o apresenta rela\u00e7\u00e3o estatisticamente significativa com a vari\u00e1vel resposta do modelo.<\/span><\/li>\n<li> <span style=\"color: #000000;\">O valor p para a vari\u00e1vel preditora \u201cdrat\u201d \u00e9 <strong>0,0315<\/strong> . Como esse valor \u00e9 inferior a 0,05, existe uma rela\u00e7\u00e3o estatisticamente significativa com a vari\u00e1vel resposta do modelo.<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Os <a href=\"https:\/\/statorials.org\/pt\/codigos-de-significado-em-r\/\" target=\"_blank\" rel=\"noopener\">c\u00f3digos de signific\u00e2ncia<\/a> abaixo da tabela de coeficientes nos dizem que um \u00fanico asterisco (*) pr\u00f3ximo ao valor p de 0,0315 significa que o valor p \u00e9 estatisticamente significativo em \u03b1 = 0,05.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Como Pr(&gt;|z|) \u00e9 calculado?<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Aqui est\u00e1 como o valor de Pr(&gt;|z|) \u00e9 realmente calculado:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Etapa 1: calcular o valor z<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">Primeiro, calculamos o <strong>valor z<\/strong> usando a seguinte f\u00f3rmula:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>valor z<\/strong> = Estimativa \/ Padr\u00e3o. Erro<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Por exemplo, aqui est\u00e1 como calcular o valor z para a vari\u00e1vel preditora \u201cdrat\u201d:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#calculate z-value<\/span>\n4.879396 \/ <span style=\"color: #000000;\">2.268115<\/span>\n\n[1] 2.151\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>Etapa 2: Calcule o valor p<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">A seguir, calculamos o valor p bicaudal. Isso representa a probabilidade de que o valor absoluto da distribui\u00e7\u00e3o normal seja maior que 2,151 ou menor que -2,151.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Podemos usar a seguinte f\u00f3rmula em R para calcular esse valor:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>valor p<\/strong> = 2 * (1-pnorma(valor z))<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Por exemplo, veja como calcular o valor p bicaudal para um valor z de 2,151:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008080;\">#calculate p-value<\/span>\n2*(1-pnorm(2.151))\n\n[1] 0.0314762\n<\/strong><\/span><\/pre>\n<p> <span style=\"color: #000000;\">Observe que esse valor p corresponde ao valor p na sa\u00edda da regress\u00e3o acima.<\/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 ajustar diferentes modelos de regress\u00e3o em R:<\/span><\/p>\n<p> Como realizar regress\u00e3o log\u00edstica em R<br \/> <a href=\"https:\/\/statorials.org\/pt\/regressao-linear-simples-em-r\/\" target=\"_blank\" rel=\"noopener\">Como realizar regress\u00e3o linear simples em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/regressao-linear-multipla-r\/\" target=\"_blank\" rel=\"noopener\">Como realizar regress\u00e3o linear m\u00faltipla em R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sempre que voc\u00ea realizar uma regress\u00e3o log\u00edstica em R, a sa\u00edda do seu modelo de regress\u00e3o ser\u00e1 exibida no seguinte formato: Coefficients: Estimate Std. Error z value Pr(&gt;|z|) (Intercept) -17.638452 9.165482 -1.924 0.0543 . available -0.004153 0.006621 -0.627 0.5305 drat 4.879396 2.268115 2.151 0.0315 * A coluna Pr(&gt;|z|) representa o valor p associado ao valor [&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-2712","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 interpretar Pr(&gt;|z|) na sa\u00edda de regress\u00e3o log\u00edstica em R - Estatoriais<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como interpretar valores de Pr(&gt;|z|) na sa\u00edda de regress\u00e3o log\u00edstica 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\/interpretar-a-saida-de-regressao-logistica-prz-r\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como interpretar Pr(&gt;|z|) na sa\u00edda de regress\u00e3o log\u00edstica em R - Estatoriais\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como interpretar valores de Pr(&gt;|z|) na sa\u00edda de regress\u00e3o log\u00edstica em R, com um exemplo.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/interpretar-a-saida-de-regressao-logistica-prz-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-21T01:34:05+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=\"3 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pt\/interpretar-a-saida-de-regressao-logistica-prz-r\/\",\"url\":\"https:\/\/statorials.org\/pt\/interpretar-a-saida-de-regressao-logistica-prz-r\/\",\"name\":\"Como interpretar Pr(&gt;|z|) na sa\u00edda de regress\u00e3o log\u00edstica em R - Estatoriais\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-21T01:34:05+00:00\",\"dateModified\":\"2023-07-21T01:34:05+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como interpretar valores de Pr(&gt;|z|) na sa\u00edda de regress\u00e3o log\u00edstica em R, com um exemplo.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/interpretar-a-saida-de-regressao-logistica-prz-r\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/interpretar-a-saida-de-regressao-logistica-prz-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/interpretar-a-saida-de-regressao-logistica-prz-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como interpretar pr(&gt;|z|) na sa\u00edda 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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