

{"id":1011747,"date":"2019-01-09T02:00:15","date_gmt":"2019-01-09T09:00:15","guid":{"rendered":"https:\/\/www.questionpro.com\/blog\/diferencas-entre-testes-nao-parametricos-e-testes-parametricos\/"},"modified":"2025-02-18T13:04:51","modified_gmt":"2025-02-18T20:04:51","slug":"diferencas-entre-testes-nao-parametricos-e-testes-parametricos","status":"publish","type":"post","link":"https:\/\/www.questionpro.com\/blog\/pt\/diferencas-entre-testes-nao-parametricos-e-testes-parametricos\/","title":{"rendered":"Diferen\u00e7as entre testes n\u00e3o param\u00e9tricos e testes param\u00e9tricos"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Os <\/span><span style=\"font-weight: 400;\">testes n\u00e3o param\u00e9tricos<\/span><span style=\"font-weight: 400;\"> s\u00e3o aquelas que analisam dados que n\u00e3o t\u00eam uma distribui\u00e7\u00e3o particular e que se baseiam numa hip\u00f3tese, mas os dados n\u00e3o est\u00e3o organizados de forma normal. Embora tenham algumas limita\u00e7\u00f5es, apresentam resultados estat\u00edsticos ordenados que facilitam a sua compreens\u00e3o. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Os <\/span><span style=\"font-weight: 400;\">testes param\u00e9tricos<\/span><span style=\"font-weight: 400;\">Em vez disso, baseia-se nas leis da distribui\u00e7\u00e3o normal para analisar os elementos de uma amostra. Geralmente, s\u00f3 se aplicam a vari\u00e1veis num\u00e9ricas e, para a sua an\u00e1lise, \u00e9 necess\u00e1rio manter uma grande popula\u00e7\u00e3o, pois isso permite que o c\u00e1lculo seja mais exato. <\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Diferen\u00e7as entre testes n\u00e3o param\u00e9tricos e testes param\u00e9tricos<\/span><\/h2>\n<div class=\"tg-wrap\">\n<table class=\"tg\" style=\"border-collapse: collapse; border-spacing: 0; margin: 0px auto; table-layout: fixed; width: 706px;\"><colgroup> <col style=\"width: 353px;\" \/> <col style=\"width: 353px;\" \/><\/colgroup>\n<tbody>\n<tr>\n<th style=\"font-family: Arial, sans-serif; font-size: 14px; font-weight: bold; padding: 10px 5px; overflow: hidden; word-break: normal; background-color: #26ade4; color: #ffffff; text-align: center; border: 1px solid #26ade4;\">Testes n\u00e3o param\u00e9tricos<\/th>\n<th style=\"font-family: Arial, sans-serif; font-size: 14px; font-weight: bold; padding: 10px 5px; overflow: hidden; word-break: normal; background-color: #26ade4; color: #ffffff; text-align: center; border: 1px solid #26ade4;\">Testes param\u00e9tricos<\/th>\n<\/tr>\n<tr>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; border: 1px solid black;\">Maior poder estat\u00edstico.<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; border: 1px solid black;\">Menor poder estat\u00edstico.<\/td>\n<\/tr>\n<tr>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; border: 1px solid black;\">Aplicam-se a vari\u00e1veis categ\u00f3ricas.<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; border: 1px solid black;\">Aplicam-se a vari\u00e1veis normais ou intervalares.<\/td>\n<\/tr>\n<tr>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; border: 1px solid black;\">Utilizado para amostras pequenas.<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; border: 1px solid black;\">Utilizado para amostras grandes.<\/td>\n<\/tr>\n<tr>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; vertical-align: top; border: 1px solid black;\">A forma da distribui\u00e7\u00e3o dos dados n\u00e3o \u00e9 conhecida.<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; vertical-align: top; border: 1px solid black;\">A tua distribui\u00e7\u00e3o de dados \u00e9 normal.<\/td>\n<\/tr>\n<tr>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; vertical-align: top; border: 1px solid black;\">N\u00e3o faz muitas suposi\u00e7\u00f5es.<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; vertical-align: top; border: 1px solid black;\">Faz muitas suposi\u00e7\u00f5es.<\/td>\n<\/tr>\n<tr>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; vertical-align: top; border: 1px solid black;\">Exigem uma condi\u00e7\u00e3o de validade inferior.<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; vertical-align: top; border: 1px solid black;\">Exigem uma condi\u00e7\u00e3o de validade superior.<\/td>\n<\/tr>\n<tr>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; vertical-align: top; border: 1px solid black;\">Maior probabilidade de erros.<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; vertical-align: top; border: 1px solid black;\">Menor probabilidade de erros.<\/td>\n<\/tr>\n<tr>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; vertical-align: top; border: 1px solid black;\">O c\u00e1lculo \u00e9 menos complicado de fazer.<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; vertical-align: top; border: 1px solid black;\">O c\u00e1lculo \u00e9 complicado de fazer.<\/td>\n<\/tr>\n<tr>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; vertical-align: top; border: 1px solid black;\">As hip\u00f3teses baseiam-se nos intervalos, na mediana e na frequ\u00eancia dos dados.<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; vertical-align: top; border: 1px solid black;\">As hip\u00f3teses baseiam-se em dados num\u00e9ricos.<\/td>\n<\/tr>\n<tr>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; vertical-align: top; border: 1px solid black;\">Os c\u00e1lculos n\u00e3o s\u00e3o exactos.<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; vertical-align: top; border: 1px solid black;\">Os c\u00e1lculos s\u00e3o demasiado exactos.<\/td>\n<\/tr>\n<tr>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; vertical-align: top; border: 1px solid black;\">Considera os valores em falta para obter informa\u00e7\u00f5es.<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: left; vertical-align: top; border: 1px solid black;\">N\u00e3o tem em conta os valores em falta para obter informa\u00e7\u00f5es.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>\u00a0<\/p>\n<p><span style=\"font-weight: 400;\">Antes de aplicar testes n\u00e3o param\u00e9tricos ou testes param\u00e9tricos, \u00e9 importante conhecer aspectos como o objetivo da investiga\u00e7\u00e3o, a dimens\u00e3o da popula\u00e7\u00e3o e a escala que ser\u00e1 utilizada para medir os dados.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00c9 prov\u00e1vel que os dados n\u00e3o satisfa\u00e7am os requisitos de um teste param\u00e9trico e que tenha de ser escolhido um teste n\u00e3o param\u00e9trico, ou seja, a dimens\u00e3o da amostra \u00e9 pequena ou a distribui\u00e7\u00e3o n\u00e3o \u00e9 normal.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Outro fator que deve ser considerado \u00e9 que os testes param\u00e9tricos podem utilizar uma distribui\u00e7\u00e3o anormal, mas um teste n\u00e3o param\u00e9trico tem pressupostos muito rigorosos que n\u00e3o podem ser ignorados.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Por \u00faltimo, se a dimens\u00e3o da amostra for pequena, \u00e9 muito prov\u00e1vel que os resultados n\u00e3o sejam alcan\u00e7ados se for utilizado um teste n\u00e3o param\u00e9trico. Quando a popula\u00e7\u00e3o n\u00e3o \u00e9 realmente grande, as hip\u00f3teses de identificar um efeito significativo s\u00e3o menores. <\/span><\/p>\n\n\n<br>\n<center>\n<a href=\"https:\/\/eu.questionpro.com\/a\/showEntry.do?lan=pt_PT&#038;custom1=blog\">\n        <button style=\"background: #ff9f00\">Cria uma conta gratuita<\/button>\n    <\/a>\n    <a href=\"https:\/\/contactar.questionpro.com\/t\/AM4X9Z3LxD?custom1=testes-n\u00e3o-param\u00e9tricos-e-testes-param\u00e9tricos\u201d target=\"_blank\" rel=\"noopener\">\n        <button>Agendar uma demonstra\u00e7\u00e3o<\/button>\n    <\/a>\n<\/center>\n<br>\n","protected":false},"excerpt":{"rendered":"<p>Os testes n\u00e3o param\u00e9tricos s\u00e3o aquelas que analisam dados que n\u00e3o t\u00eam uma distribui\u00e7\u00e3o particular e que se baseiam numa 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