{"id":437,"date":"2023-07-29T22:42:40","date_gmt":"2023-07-29T22:42:40","guid":{"rendered":"https:\/\/statorials.org\/pt\/teste-kruskal-wallis\/"},"modified":"2023-07-29T22:42:40","modified_gmt":"2023-07-29T22:42:40","slug":"teste-kruskal-wallis","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/teste-kruskal-wallis\/","title":{"rendered":"Teste kruskal-wallis: defini\u00e7\u00e3o, f\u00f3rmula e exemplo"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Um <strong>teste de Kruskal-Wallis<\/strong> \u00e9 usado para determinar se h\u00e1 ou n\u00e3o diferen\u00e7a estatisticamente significativa entre as medianas de tr\u00eas ou mais grupos independentes.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Este teste \u00e9 o equivalente n\u00e3o param\u00e9trico da <a href=\"https:\/\/statorials.org\/pt\/uma-maneira-anova\/\" target=\"_blank\" rel=\"noopener\">ANOVA unidirecional<\/a> e geralmente \u00e9 usado quando a suposi\u00e7\u00e3o de normalidade n\u00e3o \u00e9 atendida.<\/span><\/p>\n<p> <span style=\"color: #000000;\">O teste Kruskal-Wallis n\u00e3o assume <a href=\"https:\/\/statorials.org\/pt\/hipotese-de-normalidade\/\" target=\"_blank\" rel=\"noopener\">a normalidade<\/a> dos dados e \u00e9 muito menos sens\u00edvel a valores discrepantes do que a ANOVA unidirecional.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Aqui est\u00e3o alguns exemplos de quando voc\u00ea pode realizar um teste de Kruskal-Wallis:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Exemplo 1: Comparando t\u00e9cnicas de estudo<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">Voc\u00ea divide aleatoriamente uma turma de 90 alunos em tr\u00eas grupos de 30. Cada grupo usa uma t\u00e9cnica de estudo diferente durante um m\u00eas para se preparar para um exame.<\/span><\/p>\n<p> <span style=\"color: #000000;\">No final do m\u00eas, todos os alunos fazem o mesmo exame.<\/span> <span style=\"color: #000000;\">Voc\u00ea quer saber se a t\u00e9cnica de estudo tem impacto nas notas dos exames.<\/span><\/p>\n<p> <span style=\"color: #000000;\">A partir de estudos anteriores, voc\u00ea sabe que as distribui\u00e7\u00f5es das notas dos exames para essas tr\u00eas t\u00e9cnicas de estudo n\u00e3o s\u00e3o distribu\u00eddas normalmente. Portanto, voc\u00ea realiza um teste de Kruskal-Wallis para determinar se h\u00e1 uma diferen\u00e7a estatisticamente significativa entre as pontua\u00e7\u00f5es medianas dos tr\u00eas grupos.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Exemplo 2: Compara\u00e7\u00e3o da exposi\u00e7\u00e3o solar<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">Voc\u00ea deseja saber se a luz solar afeta ou n\u00e3o o crescimento de uma determinada planta, ent\u00e3o voc\u00ea planta grupos de sementes em quatro locais diferentes que recebem luz solar intensa, luz solar m\u00e9dia, luz solar baixa ou nenhuma luz solar.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Depois de um m\u00eas, voc\u00ea mede a altura de cada grupo de plantas. Sabe-se que a distribui\u00e7\u00e3o de altura para esta planta em particular n\u00e3o \u00e9 normalmente distribu\u00edda e est\u00e1 sujeita a valores discrepantes.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Para determinar se a luz solar afeta o crescimento, voc\u00ea realiza um teste de Kruskal-Wallis para determinar se h\u00e1 uma diferen\u00e7a estatisticamente significativa entre a altura mediana dos quatro grupos.<\/span><\/p>\n<h2> <strong><span style=\"color: #000000;\">Suposi\u00e7\u00f5es do teste Kruskal-Wallis<\/span><\/strong><\/h2>\n<p> <span style=\"color: #000000;\">Antes de podermos realizar um teste de Kruskal-Wallis, devemos garantir que as seguintes suposi\u00e7\u00f5es sejam atendidas:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>1. Vari\u00e1vel resposta ordinal ou cont\u00ednua<\/strong> \u2013 a vari\u00e1vel resposta deve ser uma vari\u00e1vel ordinal ou cont\u00ednua. Um exemplo de vari\u00e1vel ordinal \u00e9 uma pergunta de resposta de pesquisa medida em uma escala Likert (por exemplo, uma escala de 5 pontos que varia de &#8220;discordo totalmente&#8221; a &#8220;concordo totalmente&#8221;) e um exemplo de vari\u00e1vel cont\u00ednua \u00e9 o peso (por exemplo, medido em libras).<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>2. Independ\u00eancia<\/strong> \u2013 as observa\u00e7\u00f5es de cada grupo devem ser independentes umas das outras. Normalmente, um desenho aleat\u00f3rio cuida disso.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>3. As distribui\u00e7\u00f5es t\u00eam formatos semelhantes<\/strong> \u2013 as distribui\u00e7\u00f5es em cada grupo devem ter formatos semelhantes.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Se essas suposi\u00e7\u00f5es forem atendidas, podemos ent\u00e3o realizar um teste de Kruskal-Wallis.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Exemplo de teste de Kruskal-Wallis<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Um pesquisador quer saber se tr\u00eas medicamentos t\u00eam efeitos diferentes na dor no joelho. Ent\u00e3o, ele recruta 30 pessoas que sentem dores semelhantes nos joelhos e as divide aleatoriamente em tr\u00eas grupos para receber o medicamento 1, o medicamento 2 ou o medicamento 3.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Ap\u00f3s um m\u00eas de uso do medicamento, o pesquisador pede a cada indiv\u00edduo que avalie sua dor no joelho em uma escala de 1 a 100, sendo 100 indicando a dor mais intensa.<\/span><\/p>\n<p> <span style=\"color: #000000;\">As pontua\u00e7\u00f5es das 30 pessoas s\u00e3o apresentadas abaixo:<\/span><\/p>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: center;\"> <span style=\"color: #000000;\">droga 1<\/span><\/th>\n<th style=\"text-align: center;\"> <span style=\"color: #000000;\">droga 2<\/span><\/th>\n<th style=\"text-align: center;\"> <span style=\"color: #000000;\">droga 3<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">78<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">71<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">57<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">65<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">66<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">88<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">63<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">56<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">58<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">44<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">40<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">78<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">50<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">55<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">65<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">78<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">31<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">61<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">70<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">45<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">62<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">61<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">66<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">44<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">50<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">47<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">48<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">44<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">42<\/span><\/td>\n<td style=\"text-align: center;\"> <span style=\"color: #000000;\">77<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p> <span style=\"color: #000000;\">O pesquisador quer saber se os tr\u00eas medicamentos t\u00eam efeitos diferentes nas dores nos joelhos. Ent\u00e3o ele realiza um teste de Kruskal-Wallis usando um n\u00edvel de signific\u00e2ncia de 0,05 para determinar se h\u00e1 uma diferen\u00e7a estatisticamente significativa entre as classifica\u00e7\u00f5es medianas de dor no joelho entre esses tr\u00eas medicamentos. grupos.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\">Podemos usar as seguintes etapas para realizar o teste de Kruskal-Wallis:<\/span><\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Passo 1. Estabele\u00e7a as hip\u00f3teses.<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>A hip\u00f3tese nula (H <sub>0<\/sub> ):<\/strong> As classifica\u00e7\u00f5es medianas de dor no joelho nos tr\u00eas grupos s\u00e3o iguais.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>A hip\u00f3tese alternativa: (Ha):<\/strong> Pelo menos uma das classifica\u00e7\u00f5es medianas de dor no joelho \u00e9 diferente das demais.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Passo 2. Realize o teste de Kruskal-Wallis.<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">Para realizar um teste de Kruskal-Wallis, podemos simplesmente inserir os valores fornecidos acima na <a href=\"https:\/\/statorials.org\/pt\/calculadora-de-teste-kruskal-wallis\/\" target=\"_blank\" rel=\"noopener\">calculadora do teste de Kruskal-Wallis<\/a> :<\/span> <\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-8382\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/kruskalcalc1.png\" alt=\"Calculadora de teste Kruskal-Wallis\" width=\"420\" height=\"574\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">Em seguida, clique no bot\u00e3o \u201cCalcular\u201d:<\/span> <\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-8383 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/kruskalcalc2.png\" alt=\"\" width=\"299\" height=\"130\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\"><strong>Etapa 3. Interprete os resultados.<\/strong><\/span><\/p>\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 ( <strong>0,21342<\/strong> ) n\u00e3o \u00e9 inferior a 0,05, n\u00e3o rejeitamos a hip\u00f3tese nula.<\/span><\/p>\n<p> <span style=\"color: #000000;\">N\u00e3o temos evid\u00eancias suficientes para dizer que h\u00e1 uma diferen\u00e7a estatisticamente significativa nas classifica\u00e7\u00f5es medianas de dor no joelho entre esses tr\u00eas grupos.<\/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 um teste de Kruskal-Wallis usando diferentes softwares estat\u00edsticos:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/pt\/teste-kruskal-wallis-excel\/\" target=\"_blank\" rel=\"noopener\">Como realizar um teste Kruskal-Wallis no Excel<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/kruskal-wallis-teste-python\/\">Como realizar um teste Kruskal-Wallis em Python<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/teste-kruskal-wallis-spss\/\">Como realizar um teste Kruskal-Wallis no SPSS<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/estatisticas-do-teste-kruskal-wallis\/\" target=\"_blank\" rel=\"noopener\">Como realizar um teste de Kruskal-Wallis no Stata<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/teste-kruskal-wallis-sas\/\">Como realizar um teste Kruskal-Wallis no SAS<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/calculadora-de-teste-kruskal-wallis\/\" target=\"_blank\" rel=\"noopener\">Calculadora de teste Kruskal-Wallis online<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Um teste de Kruskal-Wallis \u00e9 usado para determinar se h\u00e1 ou n\u00e3o diferen\u00e7a estatisticamente significativa entre as medianas de tr\u00eas ou mais grupos independentes. Este teste \u00e9 o equivalente n\u00e3o param\u00e9trico da ANOVA unidirecional e geralmente \u00e9 usado quando a suposi\u00e7\u00e3o de normalidade n\u00e3o \u00e9 atendida. O teste Kruskal-Wallis n\u00e3o assume a normalidade dos dados [&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-437","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>Teste Kruskal-Wallis: defini\u00e7\u00e3o, f\u00f3rmula e exemplo \u2013 Statorials<\/title>\n<meta name=\"description\" content=\"Uma explica\u00e7\u00e3o simples de como realizar o teste Kruskal-Wallis, incluindo um exemplo passo a passo.\" \/>\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-kruskal-wallis\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Teste Kruskal-Wallis: defini\u00e7\u00e3o, f\u00f3rmula e exemplo \u2013 Statorials\" \/>\n<meta property=\"og:description\" content=\"Uma explica\u00e7\u00e3o simples de como realizar o teste Kruskal-Wallis, incluindo um exemplo passo a passo.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/teste-kruskal-wallis\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-29T22:42:40+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/kruskalcalc1.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=\"4 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pt\/teste-kruskal-wallis\/\",\"url\":\"https:\/\/statorials.org\/pt\/teste-kruskal-wallis\/\",\"name\":\"Teste Kruskal-Wallis: defini\u00e7\u00e3o, f\u00f3rmula e exemplo \u2013 Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-29T22:42:40+00:00\",\"dateModified\":\"2023-07-29T22:42:40+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Uma explica\u00e7\u00e3o simples de como realizar o teste Kruskal-Wallis, incluindo um exemplo passo a passo.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/teste-kruskal-wallis\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/teste-kruskal-wallis\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/teste-kruskal-wallis\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Teste kruskal-wallis: defini\u00e7\u00e3o, f\u00f3rmula e 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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