{"id":2639,"date":"2023-07-21T09:31:39","date_gmt":"2023-07-21T09:31:39","guid":{"rendered":"https:\/\/statorials.org\/pt\/variaveis-ficticias-sas\/"},"modified":"2023-07-21T09:31:39","modified_gmt":"2023-07-21T09:31:39","slug":"variaveis-ficticias-sas","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/variaveis-ficticias-sas\/","title":{"rendered":"Como criar vari\u00e1veis fict\u00edcias em sas (com exemplo)"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Uma <a href=\"https:\/\/statorials.org\/pt\/variaveis-ficticias-de-regressao\/\" target=\"_blank\" rel=\"noopener\">vari\u00e1vel fict\u00edcia<\/a> \u00e9 um tipo de vari\u00e1vel que criamos na an\u00e1lise de regress\u00e3o para que possamos representar uma vari\u00e1vel categ\u00f3rica como uma vari\u00e1vel num\u00e9rica que assume um de dois valores: zero ou um.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Por exemplo, suponha que temos o seguinte conjunto de dados e queremos usar <em>a idade<\/em> e <em>o estado civil<\/em> para prever <em>a renda<\/em> :<\/span> <\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-13944 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/mannequin4.png\" alt=\"\" width=\"246\" height=\"309\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">Para usar <em>o estado civil<\/em> como vari\u00e1vel preditora em um modelo de regress\u00e3o, precisamos convert\u00ea-lo em uma vari\u00e1vel dummy.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Como esta \u00e9 atualmente uma vari\u00e1vel categ\u00f3rica que pode assumir tr\u00eas valores diferentes (\u201cSolteiro\u201d, \u201cCasado\u201d ou \u201cDivorciado\u201d), precisamos criar <em>k<\/em> -1 = 3-1 = 2 vari\u00e1veis fict\u00edcias.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Para criar esta vari\u00e1vel fict\u00edcia, podemos deixar \u201cSingle\u201d como valor base, pois ele aparece com mais frequ\u00eancia. Ent\u00e3o, aqui est\u00e1 como converter\u00edamos <em>o estado civil<\/em> em vari\u00e1veis fict\u00edcias:<\/span> <\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-13950 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/mannequin6.png\" alt=\"\" width=\"615\" height=\"311\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">O exemplo a seguir mostra como criar vari\u00e1veis fict\u00edcias para este conjunto de dados exato no SAS.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo: Criando Vari\u00e1veis Dummy em SAS<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Primeiro, vamos criar o seguinte conjunto de dados no SAS:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #800080;\"><span style=\"color: #008000;\">\/*create dataset*\/\n<\/span><\/span><\/strong><\/span><strong><span style=\"color: #800080;\">data<\/span> original_data;\n    <span style=\"color: #3366ff;\">input<\/span> income age status $;\n    <span style=\"color: #3366ff;\">datalines<\/span> ;\n45 23 single\n48 25 single\n54 24 single\n57 29 single\n65 38 married\n69 36 single\n78 40 married\n83 59 divorced\n98 56 divorced\n104 64 married\n107 53 married\n;\n<span style=\"color: #800080;\">run<\/span> ;\n\n<span style=\"color: #008000;\">\/*view dataset*\/\n<\/span><span style=\"color: #800080;\">proc print<\/span> <span style=\"color: #3366ff;\">data<\/span> = original_data;<\/strong> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-23276 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/mannequinsas1.jpg\" alt=\"\" width=\"219\" height=\"310\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">A seguir, podemos usar duas instru\u00e7\u00f5es IF-THEN-ELSE para criar vari\u00e1veis fict\u00edcias para a vari\u00e1vel de <strong>estado<\/strong> :<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #800080;\"><span style=\"color: #008000;\">\/*create new dataset with dummy<\/span> <span style=\"color: #008000;\">variables*\/\n<span style=\"color: #000000;\"><span style=\"color: #800080;\">data<\/span> new_data;\n\t<span style=\"color: #3366ff;\">set<\/span> original_data;\n\t<span style=\"color: #3366ff;\">if<\/span> status = \" <span style=\"color: #ff0000;\">married<\/span> \" <span style=\"color: #3366ff;\">then<\/span> married = <span style=\"color: #008000;\">1<\/span> ;\n\t  <span style=\"color: #3366ff;\">else<\/span> married = <span style=\"color: #008000;\">0<\/span> ;\n\t<span style=\"color: #3366ff;\">if<\/span> status = \" <span style=\"color: #ff0000;\">divorced<\/span> \" <span style=\"color: #3366ff;\">then<\/span> divorced = <span style=\"color: #008000;\">1<\/span> ;\n\t  <span style=\"color: #3366ff;\">else<\/span> divorced = <span style=\"color: #008000;\">0<\/span> ;\n<span style=\"color: #800080;\">run<\/span> ;\n\n<span style=\"color: #008000;\">\/*view new dataset*\/\n<\/span><span style=\"color: #800080;\">proc print<\/span> <span style=\"color: #3366ff;\">data<\/span> =new_data;\n<\/span><\/span><\/span><\/strong><\/span><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-23277 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/mannequinsas2.jpg\" alt=\"vari\u00e1veis fict\u00edcias no exemplo SAS\" width=\"343\" height=\"305\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">Observe que os valores das duas vari\u00e1veis dummies ( <strong>casado<\/strong> e <strong>divorciado<\/strong> ) correspondem aos valores que calculamos no exemplo introdut\u00f3rio.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Poder\u00edamos ent\u00e3o usar essas vari\u00e1veis fict\u00edcias em um <a href=\"https:\/\/statorials.org\/pt\/regressao-linear-multipla-em-sas\/\" target=\"_blank\" rel=\"noopener\">modelo de regress\u00e3o<\/a> , se quis\u00e9ssemos, j\u00e1 que ambas s\u00e3o num\u00e9ricas.<\/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 executar outras tarefas comuns no SAS:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/pt\/procedimento-resumido-em-sas\/\" target=\"_blank\" rel=\"noopener\">Como usar o resumo do procedimento no SAS<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/proc-tabular-sas\/\" target=\"_blank\" rel=\"noopener\">Como usar o Proc Tabulate no SAS<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/sas-renomeando-variaveis\/\" target=\"_blank\" rel=\"noopener\">Como renomear vari\u00e1veis no SAS<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/sem-criar-novas-variaveis\/\" target=\"_blank\" rel=\"noopener\">Como criar novas vari\u00e1veis no SAS<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Uma vari\u00e1vel fict\u00edcia \u00e9 um tipo de vari\u00e1vel que criamos na an\u00e1lise de regress\u00e3o para que possamos representar uma vari\u00e1vel categ\u00f3rica como uma vari\u00e1vel num\u00e9rica que assume um de dois valores: zero ou um. Por exemplo, suponha que temos o seguinte conjunto de dados e queremos usar a idade e o estado civil para prever [&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-2639","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 criar vari\u00e1veis fict\u00edcias no SAS (com exemplo) - Statorials<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como criar vari\u00e1veis fict\u00edcias no SAS, com um exemplo completo.\" \/>\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\/variaveis-ficticias-sas\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como criar vari\u00e1veis fict\u00edcias no SAS (com exemplo) - Statorials\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como criar vari\u00e1veis fict\u00edcias no SAS, com um exemplo completo.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/variaveis-ficticias-sas\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-21T09:31:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/mannequin4.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\/variaveis-ficticias-sas\/\",\"url\":\"https:\/\/statorials.org\/pt\/variaveis-ficticias-sas\/\",\"name\":\"Como criar vari\u00e1veis fict\u00edcias no SAS (com exemplo) - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-21T09:31:39+00:00\",\"dateModified\":\"2023-07-21T09:31:39+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como criar vari\u00e1veis fict\u00edcias no SAS, com um exemplo completo.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/variaveis-ficticias-sas\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/variaveis-ficticias-sas\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/variaveis-ficticias-sas\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como criar vari\u00e1veis fict\u00edcias em sas (com exemplo)\"}]},{\"@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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