{"id":2493,"date":"2023-07-22T01:04:49","date_gmt":"2023-07-22T01:04:49","guid":{"rendered":"https:\/\/statorials.org\/pt\/comparacao-pareada-em-r\/"},"modified":"2023-07-22T01:04:49","modified_gmt":"2023-07-22T01:04:49","slug":"comparacao-pareada-em-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/comparacao-pareada-em-r\/","title":{"rendered":"Como realizar compara\u00e7\u00f5es post-hoc aos pares em r"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Uma <a href=\"https:\/\/statorials.org\/pt\/uma-maneira-anova\/\" target=\"_blank\" rel=\"noopener\">ANOVA unidirecional<\/a> \u00e9 usada para determinar se h\u00e1 ou n\u00e3o uma diferen\u00e7a estatisticamente significativa entre as m\u00e9dias de tr\u00eas ou mais grupos independentes.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Uma ANOVA unidirecional usa as seguintes hip\u00f3teses nulas e alternativas:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>H <sub>0<\/sub><\/strong> : Todas as m\u00e9dias do grupo s\u00e3o iguais.<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong><sub>HA<\/sub><\/strong> : Nem todas as m\u00e9dias dos grupos s\u00e3o iguais.<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Se o <a href=\"https:\/\/statorials.org\/pt\/valor-anova-f-valor-p\/\" target=\"_blank\" rel=\"noopener\">valor p<\/a> geral da ANOVA estiver abaixo de um certo n\u00edvel de signific\u00e2ncia (por exemplo, \u03b1 = 0,05), ent\u00e3o rejeitamos a hip\u00f3tese nula e conclu\u00edmos que todas as m\u00e9dias do grupo n\u00e3o s\u00e3o iguais.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Para descobrir quais m\u00e9dias de grupo s\u00e3o diferentes, podemos ent\u00e3o realizar <strong>compara\u00e7\u00f5es post-hoc aos pares<\/strong> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">O exemplo a seguir mostra como realizar as seguintes compara\u00e7\u00f5es post-hoc de pares em R:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">O m\u00e9todo Tukey<\/span><\/li>\n<li> <span style=\"color: #000000;\">O m\u00e9todo Scheffe<\/span><\/li>\n<li> <span style=\"color: #000000;\">O m\u00e9todo Bonferroni<\/span><\/li>\n<li> <span style=\"color: #000000;\">O m\u00e9todo Holm<\/span><\/li>\n<\/ul>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo: ANOVA unidirecional em R<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Suponha que um professor queira saber se tr\u00eas t\u00e9cnicas de estudo diferentes levam ou n\u00e3o a resultados diferentes em testes entre os alunos. Para testar isso, ela <a href=\"https:\/\/statorials.org\/pt\/selecao-aleatoria-vs.-atribuicao-aleatoria\/\" target=\"_blank\" rel=\"noopener\">designa aleatoriamente<\/a> 10 alunos para usar cada t\u00e9cnica de estudo e registra os resultados dos exames.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Podemos usar o seguinte c\u00f3digo em R para realizar uma ANOVA unidirecional para testar as diferen\u00e7as nas notas m\u00e9dias dos exames entre os tr\u00eas grupos:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame<\/span>\ndf &lt;- data.frame(technique = rep(c(\" <span style=\"color: #ff0000;\">tech1<\/span> \", \" <span style=\"color: #ff0000;\">tech2<\/span> \", \" <span style=\"color: #ff0000;\">tech3<\/span> \"), each= <span style=\"color: #008000;\">10<\/span> ),\n                 score = c(76, 77, 77, 81, 82, 82, 83, 84, 85, 89,\n                           81, 82, 83, 83, 83, 84, 87, 90, 92, 93,\n                           77, 78, 79, 88, 89, 90, 91, 95, 95, 98))\n\n<span style=\"color: #008080;\">#perform one-way ANOVA\n<\/span>model &lt;- aov(score ~ technique, data = df)\n\n<span style=\"color: #008080;\">#view output of ANOVA\n<\/span>summary(model)\n\n            Df Sum Sq Mean Sq F value Pr(&gt;F)  \ntechnical 2 211.5 105.73 3.415 0.0476 *\nResiduals 27 836.0 30.96                 \n---\nSignificant. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">O valor p geral da ANOVA (0,0476) \u00e9 menor que \u03b1 = 0,05, portanto rejeitaremos a hip\u00f3tese nula de que a nota m\u00e9dia do exame \u00e9 a mesma para cada t\u00e9cnica de estudo.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Podemos fazer compara\u00e7\u00f5es post-hoc aos pares para determinar quais grupos t\u00eam m\u00e9dias diferentes.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>O m\u00e9todo Tukey<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">\u00c9 melhor usar o m\u00e9todo post hoc de Tukey quando o tamanho da amostra de cada grupo for igual.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Podemos usar a fun\u00e7\u00e3o <strong>TukeyHSD()<\/strong> integrada para executar o m\u00e9todo post-hoc Tukey em R:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#perform the Tukey post-hoc method<\/span>\nTukeyHSD(model, conf. <span style=\"color: #3366ff;\">level<\/span> = <span style=\"color: #008000;\">.95<\/span> )\n\n  Tukey multiple comparisons of means\n    95% family-wise confidence level\n\nFit: aov(formula = score ~ technique, data = df)\n\n$technical\n            diff lwr upr p adj\ntech2-tech1 4.2 -1.9700112 10.370011 0.2281369\ntech3-tech1 6.4 0.2299888 12.570011 0.0409017\ntech3-tech2 2.2 -3.9700112 8.370011 0.6547756<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Pelo resultado, podemos perceber que o \u00fanico valor p (\u201c <strong>p adj<\/strong> \u201d) menor que 0,05 \u00e9 a diferen\u00e7a entre a t\u00e9cnica e a t\u00e9cnica 3.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Assim, concluir\u00edamos que existe apenas uma diferen\u00e7a estatisticamente significativa nas notas m\u00e9dias dos exames entre os alunos que utilizaram a T\u00e9cnica 1 e a T\u00e9cnica 3.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>O m\u00e9todo Scheffe<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">O m\u00e9todo Scheffe \u00e9 o m\u00e9todo de compara\u00e7\u00e3o par a par post-hoc mais conservador e produz os intervalos de confian\u00e7a mais amplos ao comparar m\u00e9dias de grupos.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Podemos usar a fun\u00e7\u00e3o <strong>ScheffeTest()<\/strong> do pacote <a href=\"https:\/\/cran.r-project.org\/web\/packages\/DescTools\/DescTools.pdf\" target=\"_blank\" rel=\"noopener\">DescTools<\/a> para executar o m\u00e9todo post-hoc Scheffe em R:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (DescTools)<\/span>\n\n#perform the Scheffe post-hoc method<\/span>\nScheffeTest(model)\n\n  Posthoc multiple comparisons of means: Scheffe Test \n    95% family-wise confidence level\n\n$technical\n            diff lwr.ci upr.ci pval    \ntech2-tech1 4.2 -2.24527202 10.645272 0.2582    \ntech3-tech1 6.4 -0.04527202 12.845272 0.0519 .  \ntech3-tech2 2.2 -4.24527202 8.645272 0.6803    \n\n---\nSignificant. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1'''156<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Pelos resultados podemos perceber que n\u00e3o existem valores de p inferiores a 0,05, portanto concluir\u00edamos que n\u00e3o h\u00e1 diferen\u00e7a estatisticamente significativa nas notas m\u00e9dias dos exames entre os grupos.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>O m\u00e9todo Bonferroni<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">\u00c9 melhor usar o m\u00e9todo Bonferroni quando voc\u00ea deseja realizar um conjunto de compara\u00e7\u00f5es planejadas aos pares.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Podemos usar a seguinte sintaxe em R para executar o m\u00e9todo post hoc de Bonferroni:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#perform the Bonferroni post-hoc method\n<span style=\"color: #000000;\">pairwise. <span style=\"color: #3366ff;\">t<\/span> . <span style=\"color: #3366ff;\">test<\/span> (df$score, df$technique, p. <span style=\"color: #3366ff;\">adj<\/span> = ' <span style=\"color: #ff0000;\">bonferroni<\/span> ')<\/span>\n<\/span>\n\tPairwise comparisons using t tests with pooled SD \n\ndata: df$score and df$technique \n\n      tech1 tech2\ntech2 0.309 -    \ntech3 0.048 1.000\n\nP value adjustment method: bonferroni<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Pelo resultado, podemos perceber que o \u00fanico valor de p menor que 0,05 \u00e9 a diferen\u00e7a entre a t\u00e9cnica e a t\u00e9cnica 3.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Assim, concluir\u00edamos que existe apenas uma diferen\u00e7a estatisticamente significativa nas notas m\u00e9dias dos exames entre os alunos que utilizaram a T\u00e9cnica 1 e a T\u00e9cnica 3.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>O m\u00e9todo Holm<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">O m\u00e9todo Holm tamb\u00e9m \u00e9 usado quando voc\u00ea deseja realizar um conjunto de compara\u00e7\u00f5es planejadas de pares de antem\u00e3o e tende a ter um poder ainda maior do que o m\u00e9todo Bonferroni, por isso \u00e9 frequentemente preferido.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Podemos usar a seguinte sintaxe em R para executar o m\u00e9todo post-hoc de Holm:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#perform the Holm post-hoc method\n<span style=\"color: #000000;\">pairwise. <span style=\"color: #3366ff;\">t<\/span> . <span style=\"color: #3366ff;\">test<\/span> (df$score, df$technique, p. <span style=\"color: #3366ff;\">adj<\/span> = ' <span style=\"color: #ff0000;\">holm<\/span> ')<\/span>\n<\/span>\n\tPairwise comparisons using t tests with pooled SD \n\ndata: df$score and df$technique \n\n      tech1 tech2\ntech2 0.206 -    \ntech3 0.048 0.384\n\nP value adjustment method: holm<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Pelo resultado, podemos perceber que o \u00fanico valor de p menor que 0,05 \u00e9 a diferen\u00e7a entre a t\u00e9cnica e a t\u00e9cnica 3.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Assim, mais uma vez, concluir\u00edamos que existe apenas uma diferen\u00e7a estatisticamente significativa nas notas m\u00e9dias dos exames entre os alunos que utilizaram a T\u00e9cnica 1 e a T\u00e9cnica 3.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Os tutoriais a seguir fornecem informa\u00e7\u00f5es adicionais sobre ANOVA e testes post-hoc:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/pt\/valor-anova-f-valor-p\/\" target=\"_blank\" rel=\"noopener\">Como interpretar o valor F e o valor P na ANOVA<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/como-relatar-resultados-anova\/\" target=\"_blank\" rel=\"noopener\">O guia completo: como relatar resultados de ANOVA<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/tukey-vs-bonferroni-vs-scheffe\/\" target=\"_blank\" rel=\"noopener\">Tukey vs. Bonferroni vs. Scheffe: Qual teste voc\u00ea deve usar?<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Uma ANOVA unidirecional \u00e9 usada para determinar se h\u00e1 ou n\u00e3o uma diferen\u00e7a estatisticamente significativa entre as m\u00e9dias de tr\u00eas ou mais grupos independentes. Uma ANOVA unidirecional usa as seguintes hip\u00f3teses nulas e alternativas: H 0 : Todas as m\u00e9dias do grupo s\u00e3o iguais. HA : Nem todas as m\u00e9dias dos grupos s\u00e3o iguais. Se [&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-2493","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 compara\u00e7\u00f5es post-hoc aos pares em R - Estatoriais<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como realizar compara\u00e7\u00f5es post-hoc de pares em R, 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\/comparacao-pareada-em-r\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como realizar compara\u00e7\u00f5es post-hoc aos pares em R - Estatoriais\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como realizar compara\u00e7\u00f5es post-hoc de pares em R, incluindo um exemplo completo.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/comparacao-pareada-em-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-22T01:04:49+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=\"5 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pt\/comparacao-pareada-em-r\/\",\"url\":\"https:\/\/statorials.org\/pt\/comparacao-pareada-em-r\/\",\"name\":\"Como realizar compara\u00e7\u00f5es post-hoc aos pares em R - Estatoriais\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-22T01:04:49+00:00\",\"dateModified\":\"2023-07-22T01:04:49+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como realizar compara\u00e7\u00f5es post-hoc de pares em R, incluindo um exemplo completo.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/comparacao-pareada-em-r\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/comparacao-pareada-em-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/comparacao-pareada-em-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como realizar compara\u00e7\u00f5es post-hoc aos pares 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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