{"id":3498,"date":"2023-07-17T04:24:49","date_gmt":"2023-07-17T04:24:49","guid":{"rendered":"https:\/\/statorials.org\/pt\/definir-semente-em-r\/"},"modified":"2023-07-17T04:24:49","modified_gmt":"2023-07-17T04:24:49","slug":"definir-semente-em-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/definir-semente-em-r\/","title":{"rendered":"Como (e quando) usar set.seed em r"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">A fun\u00e7\u00e3o <strong>set.seed()<\/strong> em R \u00e9 usada para criar resultados repet\u00edveis ao escrever c\u00f3digo que envolve a cria\u00e7\u00e3o de vari\u00e1veis que assumem valores aleat\u00f3rios.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Ao usar a fun\u00e7\u00e3o <strong>set.seed()<\/strong> voc\u00ea garante que os mesmos valores aleat\u00f3rios sejam produzidos toda vez que voc\u00ea executar o c\u00f3digo.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Esta fun\u00e7\u00e3o usa a seguinte sintaxe b\u00e1sica:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>set.seed(semente)<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">Ouro:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>semente<\/strong> : qualquer n\u00famero que voc\u00ea quiser.<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Os exemplos a seguir mostram como usar esta fun\u00e7\u00e3o na pr\u00e1tica.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Exemplo 1: Gere valores aleat\u00f3rios sem usar set.seed()<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Suponha que usemos a fun\u00e7\u00e3o <strong>rnorm()<\/strong> para criar um quadro de dados com tr\u00eas vari\u00e1veis que assumem valores aleat\u00f3rios que seguem uma distribui\u00e7\u00e3o normal padr\u00e3o:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008080;\">#create data frame\n<\/span>df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (var1 = rnorm(10),\n                 var2 = rnorm(10),\n                 var3 = rnorm(10))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n          var1 var2 var3\n1 0.13076685 -0.32183484 0.08083558\n2 0.93926332 0.92271464 1.14695121\n3 1.97227368 0.01140237 0.29325751\n4 1.99656555 0.26735086 1.17131155\n5 -1.07893403 -0.12748185 -0.75510058\n6 -0.58955485 -0.29720114 0.57928670\n7 1.39367811 -1.43043111 -0.39395086\n8 -0.09977302 -1.93133994 -0.66654713\n9 -0.71876371 2.27999183 0.45990405\n10 0.90421007 2.28077581 0.57545709<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\">Se tentarmos criar o mesmo quadro de dados novamente usando <strong>rnorm()<\/strong> , n\u00e3o h\u00e1 garantia de que os valores ser\u00e3o os mesmos, pois n\u00e3o usamos a fun\u00e7\u00e3o <strong>set.seed()<\/strong> :<\/span><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008080;\">#create data frame\n<\/span>df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (var1 = rnorm(10),\n                 var2 = rnorm(10),\n                 var3 = rnorm(10))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n         var1 var2 var3\n1 0.1841698 1.18134622 -0.9410759\n2 -1.3535924 -0.73136515 -0.2802438\n3 1.0323083 0.06530416 -1.3447057\n4 -0.6540649 -0.45005680 1.1222456\n5 0.5201189 -0.03688566 -0.6317776\n6 0.6119033 -0.13083390 0.7034120\n7 -0.1781823 0.56807218 0.2138826\n8 -0.1325103 1.10700318 -0.6799447\n9 -0.6185180 0.12327017 -0.2411492\n10 -0.2699959 -0.04093012 0.5289240\n<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Observe que os valores de cada coluna no quadro de dados s\u00e3o completamente diferentes.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Exemplo 2: Gere valores aleat\u00f3rios usando set.seed()<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como usar a fun\u00e7\u00e3o <strong>set.seed()<\/strong> antes de usar a fun\u00e7\u00e3o <strong>rnorm()<\/strong> para criar um quadro de dados com tr\u00eas vari\u00e1veis que assumem valores aleat\u00f3rios:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008080;\">#make this example reproducible\n<span style=\"color: #000000;\">set. <span style=\"color: #3366ff;\">seeds<\/span> (7)\n<\/span>\n#create data frame\n<\/span>df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (var1 = rnorm(10),\n                 var2 = rnorm(10),\n                 var3 = rnorm(10))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n         var1 var2 var3\n1 2.2872472 0.356986230 0.8397504\n2 -1.1967717 2.716751783 0.7053418\n3 -0.6942925 2.281451926 1.3059647\n4 -0.4122930 0.324020540 -1.3879962\n5 -0.9706733 1.896067067 1.2729169\n6 -0.9472799 0.467680511 0.1841928\n7 0.7481393 -0.893800723 0.7522799\n8 -0.1169552 -0.307328300 0.5917451\n9 0.1526576 -0.004822422 -0.9830526\n10 2.1899781 0.988164149 -0.2760640\n<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Se usarmos <strong>set.seed()<\/strong> com o mesmo valor inicial de antes e criarmos o quadro de dados novamente, \u00e9 garantido que ele ter\u00e1 os mesmos valores do quadro de dados anterior:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008080;\">#make this example reproducible\n<\/span>set. <span style=\"color: #3366ff;\">seeds<\/span> (7)\n\n<span style=\"color: #008080;\">#create data frame\n<\/span>df2 &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (var1 = rnorm(10),\n                  var2 = rnorm(10),\n                  var3 = rnorm(10))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df2\n\n         var1 var2 var3\n1 2.2872472 0.356986230 0.8397504\n2 -1.1967717 2.716751783 0.7053418\n3 -0.6942925 2.281451926 1.3059647\n4 -0.4122930 0.324020540 -1.3879962\n5 -0.9706733 1.896067067 1.2729169\n6 -0.9472799 0.467680511 0.1841928\n7 0.7481393 -0.893800723 0.7522799\n8 -0.1169552 -0.307328300 0.5917451\n9 0.1526576 -0.004822422 -0.9830526\n10 2.1899781 0.988164149 -0.2760640<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Observe que os valores neste quadro de dados correspondem aos do quadro de dados anterior.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Nota<\/strong> : Neste exemplo, optamos por usar <strong>7<\/strong> como valor inicial, mas voc\u00ea pode escolher qualquer n\u00famero que desejar, como 0, 54, 99, 100, 48787, etc.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Os tutoriais a seguir explicam como usar outras fun\u00e7\u00f5es comuns em R:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/pt\/funcao-r-dim\/\" target=\"_blank\" rel=\"noopener\">Como usar a fun\u00e7\u00e3o dim() em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/funcao-de-tabela-em-r\/\" target=\"_blank\" rel=\"noopener\">Como usar a fun\u00e7\u00e3o table() em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/funcao-de-sinal-em-r\/\" target=\"_blank\" rel=\"noopener\">Como usar a fun\u00e7\u00e3o sign() em R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A fun\u00e7\u00e3o set.seed() em R \u00e9 usada para criar resultados repet\u00edveis ao escrever c\u00f3digo que envolve a cria\u00e7\u00e3o de vari\u00e1veis que assumem valores aleat\u00f3rios. Ao usar a fun\u00e7\u00e3o set.seed() voc\u00ea garante que os mesmos valores aleat\u00f3rios sejam produzidos toda vez que voc\u00ea executar o c\u00f3digo. Esta fun\u00e7\u00e3o usa a seguinte sintaxe b\u00e1sica: set.seed(semente) Ouro: semente [&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-3498","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 (e quando) usar set.seed em R \u2013 Statorials<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como e quando usar a fun\u00e7\u00e3o set.seed() em R, 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\/definir-semente-em-r\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como (e quando) usar set.seed em R \u2013 Statorials\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como e quando usar a fun\u00e7\u00e3o set.seed() em R, incluindo exemplos.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/definir-semente-em-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-17T04:24:49+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\/definir-semente-em-r\/\",\"url\":\"https:\/\/statorials.org\/pt\/definir-semente-em-r\/\",\"name\":\"Como (e quando) usar set.seed em R \u2013 Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-17T04:24:49+00:00\",\"dateModified\":\"2023-07-17T04:24:49+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como e quando usar a fun\u00e7\u00e3o set.seed() em R, incluindo exemplos.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/definir-semente-em-r\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/definir-semente-em-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/definir-semente-em-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como (e quando) usar set.seed 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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