{"id":2533,"date":"2023-07-21T20:48:36","date_gmt":"2023-07-21T20:48:36","guid":{"rendered":"https:\/\/statorials.org\/pt\/teste-de-classificacao-de-sinal-de-wilcoxon-na-camara-de-descompressao\/"},"modified":"2023-07-21T20:48:36","modified_gmt":"2023-07-21T20:48:36","slug":"teste-de-classificacao-de-sinal-de-wilcoxon-na-camara-de-descompressao","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/teste-de-classificacao-de-sinal-de-wilcoxon-na-camara-de-descompressao\/","title":{"rendered":"Como realizar um teste de classifica\u00e7\u00e3o assinada de wilcoxon no sas"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">O <a href=\"https:\/\/statorials.org\/pt\/teste-de-classificacao-do-sinal-de-wilcoxon\/\" target=\"_blank\" rel=\"noopener\">teste Wilcoxon Signed-Rank<\/a> \u00e9 a vers\u00e3o n\u00e3o param\u00e9trica do <a href=\"https:\/\/statorials.org\/pt\/teste-t-de-amostras-pareadas\/\" target=\"_blank\" rel=\"noopener\">teste t para amostras pareadas<\/a> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">\u00c9 usado para testar se existe ou n\u00e3o uma diferen\u00e7a significativa entre as m\u00e9dias de duas popula\u00e7\u00f5es quando a distribui\u00e7\u00e3o das diferen\u00e7as entre as duas amostras n\u00e3o pode ser considerada normal.<\/span><\/p>\n<p> <span style=\"color: #000000;\">O exemplo a seguir mostra como realizar um teste Wilcoxon Signed-Rank no SAS.<\/span><\/p>\n<h3> <strong>Exemplo: teste de classifica\u00e7\u00e3o assinada de Wilcoxon no SAS<\/strong><\/h3>\n<p> <span style=\"color: #000000;\">Suponha que um engenheiro queira saber se um novo tratamento de combust\u00edvel provoca uma altera\u00e7\u00e3o na quilometragem m\u00e9dia por gal\u00e3o de um determinado carro. Para testar isso, mede o mpg de 12 carros com e sem tratamento de combust\u00edvel.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Os resultados s\u00e3o apresentados na tabela abaixo:<\/span> <\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-22520 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/wilcox11.jpg\" alt=\"\" width=\"280\" height=\"347\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">Podemos usar o c\u00f3digo a seguir para realizar um teste Wilcoxon Signed-Rank no SAS para determinar se h\u00e1 uma diferen\u00e7a significativa no mpg m\u00e9dio entre os dois grupos:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">\/*create dataset*\/\n<\/span><span style=\"color: #800080;\">data<\/span> my_data;\n    <span style=\"color: #3366ff;\">input<\/span> car with_fuel without_fuel;\n    <span style=\"color: #3366ff;\">datalines<\/span> ;\n1 20 24\n2 23 25\n3 21 21\n4 25 22\n5 18 23\n6 17 18\n7 18 17\n8 24 28\n9 20 24\n10 24 27\n11 23 21\n12 19 23\n;\n<span style=\"color: #800080;\">run<\/span> ;\n\n<span style=\"color: #008000;\">\/*create new dataset with difference between two fuel treatments*\/\n<\/span><span style=\"color: #800080;\">data<\/span> my_data2;\n    <span style=\"color: #3366ff;\">set<\/span> my_data;\n    diff=with_fuel-without_fuel;\n<span style=\"color: #800080;\">run<\/span> ;\n\n<span style=\"color: #008000;\">\/*perform Wilcoxon Signed Rank Test*\/\n<\/span><span style=\"color: #800080;\">proc univariate<\/span> data=my_data2;\n    <span style=\"color: #3366ff;\">var<\/span> diff;\n<span style=\"color: #800080;\">run<\/span> ;\n<\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-22521 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/wilcoxsas1.jpg\" alt=\"\" width=\"368\" height=\"464\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">A partir dos resultados, podemos ver que a diferen\u00e7a m\u00e9dia em mpg entre os carros que receberam o tratamento e os que n\u00e3o receberam \u00e9 de <strong>-1,75<\/strong> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">Na tabela intitulada <strong>Testes de Localiza\u00e7\u00e3o<\/strong> podemos observar o seguinte:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">Estat\u00edstica do teste de classifica\u00e7\u00e3o assinada de Wilcoxon: <strong>-22,5<\/strong><\/span><\/li>\n<li> <span style=\"color: #000000;\">O valor p correspondente: <strong>0,0469<\/strong><\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Lembre-se de que o teste de postos sinalizados de Wilcoxon usa as seguintes hip\u00f3teses nulas e alternativas:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>H <sub>0<\/sub> :<\/strong> MPG \u00e9 igual entre os dois grupos<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong><sub>HA<\/sub> :<\/strong> MPG <em>n\u00e3o<\/em> \u00e9 igual entre os dois grupos<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Como o <a href=\"https:\/\/statorials.org\/pt\/p-valores-significancia-estatistica\/\" target=\"_blank\" rel=\"noopener\">valor p<\/a> do teste (0,0469) \u00e9 inferior a 0,05, rejeitamos a hip\u00f3tese nula.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Isto significa que temos evid\u00eancias suficientes para dizer que o mpg m\u00e9dio n\u00e3o \u00e9 igual entre os dois grupos.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>O teste Wilcoxon Signed-Rank \u00e9 a vers\u00e3o n\u00e3o param\u00e9trica do teste t para amostras pareadas . \u00c9 usado para testar se existe ou n\u00e3o uma diferen\u00e7a significativa entre as m\u00e9dias de duas popula\u00e7\u00f5es quando a distribui\u00e7\u00e3o das diferen\u00e7as entre as duas amostras n\u00e3o pode ser considerada normal. O exemplo a seguir mostra como realizar um [&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-2533","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 realizar um teste de classifica\u00e7\u00e3o assinada de Wilcoxon no SAS - Statorials<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como realizar um teste de classifica\u00e7\u00e3o sinalizada de Wilcoxon no SAS, incluindo 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\/teste-de-classificacao-de-sinal-de-wilcoxon-na-camara-de-descompressao\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como realizar um teste de classifica\u00e7\u00e3o assinada de Wilcoxon no SAS - 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