{"id":2530,"date":"2023-07-21T21:07:56","date_gmt":"2023-07-21T21:07:56","guid":{"rendered":"https:\/\/statorials.org\/pt\/correlacao-na-camara-de-ar\/"},"modified":"2023-07-21T21:07:56","modified_gmt":"2023-07-21T21:07:56","slug":"correlacao-na-camara-de-ar","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/correlacao-na-camara-de-ar\/","title":{"rendered":"Como calcular a correla\u00e7\u00e3o no sas (com exemplos)"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Uma forma de quantificar a rela\u00e7\u00e3o entre duas vari\u00e1veis \u00e9 utilizar o <a href=\"https:\/\/statorials.org\/pt\/coeficiente-de-correlacao-de-pearson-1\/\" target=\"_blank\" rel=\"noopener\">coeficiente de correla\u00e7\u00e3o de Pearson<\/a> , que mede a associa\u00e7\u00e3o linear entre duas vari\u00e1veis <em>.<\/em><\/span><\/p>\n<p> <span style=\"color: #000000;\">Sempre assume um valor entre -1 e 1 onde:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">-1 indica uma correla\u00e7\u00e3o linear perfeitamente negativa entre duas vari\u00e1veis<\/span><\/li>\n<li> <span style=\"color: #000000;\">0 indica nenhuma correla\u00e7\u00e3o linear entre duas vari\u00e1veis<\/span><\/li>\n<li> <span style=\"color: #000000;\">1 indica uma correla\u00e7\u00e3o linear perfeitamente positiva entre duas vari\u00e1veis<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Quanto mais longe o coeficiente de correla\u00e7\u00e3o estiver de zero, mais forte ser\u00e1 a rela\u00e7\u00e3o entre as duas vari\u00e1veis.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Os exemplos a seguir mostram como usar <strong>proc corr<\/strong> no SAS para calcular o coeficiente de correla\u00e7\u00e3o entre vari\u00e1veis no conjunto de dados integrado do SAS chamado <a href=\"https:\/\/documentation.sas.com\/doc\/en\/pgmsascdc\/9.4_3.4\/statug\/statug_sashelp_sect012.htm\" target=\"_blank\" rel=\"noopener\">Fish<\/a> , que cont\u00e9m v\u00e1rias medi\u00e7\u00f5es para 159 peixes diferentes capturados em um lago na Finl\u00e2ndia.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Podemos usar <strong>proc print<\/strong> para exibir as primeiras 10 observa\u00e7\u00f5es deste conjunto de dados:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">\/*view first 10 observations from <em>Fish<\/em> dataset*\/\n<\/span><span style=\"color: #800080;\">proc print<\/span> <span style=\"color: #3366ff;\">data<\/span> =sashelp.Fish( <span style=\"color: #3366ff;\">obs<\/span> = <span style=\"color: #008000;\">10<\/span> );\n\n<span style=\"color: #800080;\">run<\/span> ;\n<\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-22476 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/poisson1.jpg\" alt=\"\" width=\"492\" height=\"281\" srcset=\"\" sizes=\"auto, \"><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo 1: Correla\u00e7\u00e3o entre duas vari\u00e1veis<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Podemos usar o seguinte c\u00f3digo para calcular o coeficiente de correla\u00e7\u00e3o de Pearson entre as vari\u00e1veis Altura e Largura:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">\/*calculate correlation coefficient between Height and Width*\/\n<\/span><span style=\"color: #800080;\"><span style=\"color: #000000;\"><span style=\"color: #800080;\">proc corr<\/span> <span style=\"color: #3366ff;\">data<\/span> =sashelp.fish;\n\t<span style=\"color: #3366ff;\">var<\/span> HeightWidth;\n<\/span>\n<span style=\"color: #800080;\">run<\/span> ;\n<\/span><\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-22491 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/corrsas1.jpg\" alt=\"\" width=\"434\" height=\"333\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">A primeira tabela exibe estat\u00edsticas resumidas de altura e largura.<\/span><\/p>\n<p> <span style=\"color: #000000;\">A segunda tabela mostra o coeficiente de correla\u00e7\u00e3o de Pearson entre as duas vari\u00e1veis, incluindo um <a href=\"https:\/\/statorials.org\/pt\/p-valores-significancia-estatistica\/\" target=\"_blank\" rel=\"noopener\">valor p<\/a> que nos diz se a correla\u00e7\u00e3o \u00e9 estatisticamente significativa.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Pelo resultado podemos ver:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">Coeficiente de correla\u00e7\u00e3o de Pearson: <strong>0,79288<\/strong><\/span><\/li>\n<li> <span style=\"color: #000000;\">Valor P: <strong>&lt;0,0001<\/strong><\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Isto diz-nos que existe uma forte correla\u00e7\u00e3o positiva entre altura e largura e que a correla\u00e7\u00e3o \u00e9 estatisticamente significativa, uma vez que o valor p \u00e9 inferior a \u03b1 = 0,05.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Relacionado:<\/strong> <a href=\"https:\/\/statorials.org\/pt\" target=\"_blank\" rel=\"noopener\">O que \u00e9 considerado uma correla\u00e7\u00e3o \u201cforte\u201d?<\/a><\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo 2: Correla\u00e7\u00e3o entre todas as vari\u00e1veis<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Podemos usar o seguinte c\u00f3digo para calcular o coeficiente de correla\u00e7\u00e3o de Pearson entre todas as combina\u00e7\u00f5es pares de vari\u00e1veis no conjunto de dados:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">\/*calculate correlation coefficient between all pairwise combinations of variables*\/\n<\/span><span style=\"color: #800080;\"><span style=\"color: #000000;\"><span style=\"color: #800080;\">proc corr<\/span> <span style=\"color: #3366ff;\">data<\/span> =sashelp.fish;\n<\/span>\nrun;\n<\/span><\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-22492\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/corrsas2.jpg\" alt=\"matriz de correla\u00e7\u00e3o no SAS\" width=\"447\" height=\"649\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">O resultado exibe uma <a href=\"https:\/\/statorials.org\/pt\/como-ler-uma-matriz-de-correlacao\/\" target=\"_blank\" rel=\"noopener\">matriz de correla\u00e7\u00e3o<\/a> , que cont\u00e9m o coeficiente de correla\u00e7\u00e3o de Pearson e os valores p correspondentes para cada combina\u00e7\u00e3o de pares de vari\u00e1veis num\u00e9ricas no conjunto de dados.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Por exemplo:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">O coeficiente de correla\u00e7\u00e3o de Pearson entre peso e comprimento1 \u00e9 <strong>0,91644.<\/strong><\/span><\/li>\n<li> <span style=\"color: #000000;\">O coeficiente de correla\u00e7\u00e3o de Pearson entre peso e comprimento2 \u00e9 <strong>0,91937.<\/strong><\/span><\/li>\n<li> <span style=\"color: #000000;\">O coeficiente de correla\u00e7\u00e3o de Pearson entre peso e comprimento3 \u00e9 <strong>0,92447.<\/strong><\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">E assim por diante.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo 3: Visualize a correla\u00e7\u00e3o com um gr\u00e1fico de dispers\u00e3o<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Tamb\u00e9m podemos usar a fun\u00e7\u00e3o <strong>plots<\/strong> para criar um gr\u00e1fico de dispers\u00e3o para visualizar a correla\u00e7\u00e3o entre duas vari\u00e1veis:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">\/*visualize correlation between Height and Width*\/\n<\/span><span style=\"color: #800080;\"><span style=\"color: #000000;\"><span style=\"color: #800080;\">proc corr<\/span> <span style=\"color: #3366ff;\">data<\/span> =sashelp.fish <span style=\"color: #3366ff;\">plots<\/span> =scatter( <span style=\"color: #3366ff;\">nvar<\/span> =all);;\n\t<span style=\"color: #3366ff;\">var<\/span> HeightWidth;\n<\/span>\nrun;<\/span><\/strong> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-22493 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/corrsas3.jpg\" alt=\"\" width=\"569\" height=\"448\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">No gr\u00e1fico podemos ver a forte correla\u00e7\u00e3o positiva entre altura e largura. \u00c0 medida que a altura aumenta, a largura tamb\u00e9m tende a aumentar.<\/span><\/p>\n<p> <span style=\"color: #000000;\">No canto superior esquerdo do gr\u00e1fico podemos ver tamb\u00e9m o total de observa\u00e7\u00f5es utilizadas, o coeficiente de correla\u00e7\u00e3o e o valor p do coeficiente de correla\u00e7\u00e3o.<\/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 realizar outras opera\u00e7\u00f5es comuns no SAS:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/pt\/tabela-de-frequencia-sas\/\" target=\"_blank\" rel=\"noopener\">Como criar tabelas de frequ\u00eancia no SAS<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/procedimento-resumido-em-sas\/\" target=\"_blank\" rel=\"noopener\">Como calcular estat\u00edsticas descritivas no SAS<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Uma forma de quantificar a rela\u00e7\u00e3o entre duas vari\u00e1veis \u00e9 utilizar o coeficiente de correla\u00e7\u00e3o de Pearson , que mede a associa\u00e7\u00e3o linear entre duas vari\u00e1veis . Sempre assume um valor entre -1 e 1 onde: -1 indica uma correla\u00e7\u00e3o linear perfeitamente negativa entre duas vari\u00e1veis 0 indica nenhuma correla\u00e7\u00e3o linear entre duas vari\u00e1veis 1 [&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-2530","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 no SAS (com exemplos) - Statorials<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como calcular a correla\u00e7\u00e3o no SAS, 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-na-camara-de-ar\/\" \/>\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 no SAS (com exemplos) - Statorials\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como calcular a correla\u00e7\u00e3o no SAS, com v\u00e1rios exemplos.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/correlacao-na-camara-de-ar\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-21T21:07:56+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/poisson1.jpg\" \/>\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\/correlacao-na-camara-de-ar\/\",\"url\":\"https:\/\/statorials.org\/pt\/correlacao-na-camara-de-ar\/\",\"name\":\"Como calcular a correla\u00e7\u00e3o no SAS (com exemplos) - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-21T21:07:56+00:00\",\"dateModified\":\"2023-07-21T21:07:56+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como calcular a correla\u00e7\u00e3o no SAS, com v\u00e1rios exemplos.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/correlacao-na-camara-de-ar\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/correlacao-na-camara-de-ar\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/correlacao-na-camara-de-ar\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como calcular a correla\u00e7\u00e3o no sas (com exemplos)\"}]},{\"@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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