

{"id":1011524,"date":"2018-10-01T02:00:07","date_gmt":"2018-10-01T09:00:07","guid":{"rendered":"https:\/\/www.questionpro.com\/blog\/o-que-e-a-ponderacao-e-como-aplica-la\/"},"modified":"2025-02-17T14:38:49","modified_gmt":"2025-02-17T21:38:49","slug":"o-que-e-a-ponderacao-e-como-aplica-la","status":"publish","type":"post","link":"https:\/\/www.questionpro.com\/blog\/pt\/o-que-e-a-ponderacao-e-como-aplica-la\/","title":{"rendered":"O que \u00e9 a pondera\u00e7\u00e3o e como aplic\u00e1-la?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">A<\/span><b> pondera\u00e7\u00e3o<\/b><span style=\"font-weight: 400;\"> \u00e9 uma t\u00e9cnica normalmente utilizada na amostragem estat\u00edstica para ajustar as amostras. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Neste artigo, vais ficar a saber o que \u00e9 e como o fazer de forma eficaz.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">O que \u00e9 a pondera\u00e7\u00e3o?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">A pondera\u00e7\u00e3o \u00e9 uma t\u00e9cnica estat\u00edstica que pode ser utilizada para corrigir eventuais desequil\u00edbrios nos perfis das amostras ap\u00f3s a recolha de dados. <\/span><span style=\"font-weight: 400;\">recolha de dados<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Uma pondera\u00e7\u00e3o estat\u00edstica \u00e9 um valor dado para aumentar ou diminuir a import\u00e2ncia de um elemento, uma vez que, muitas vezes, os dados recolhidos em inqu\u00e9ritos n\u00e3o prov\u00eam exatamente de uma amostra representativa da popula\u00e7\u00e3o. <\/span><span style=\"font-weight: 400;\">amostra representativa da popula\u00e7\u00e3o<\/span><span style=\"font-weight: 400;\">. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Geralmente, \u00e9 utilizado para que o perfil da popula\u00e7\u00e3o em estudo seja <\/span><span style=\"font-weight: 400;\">popula\u00e7\u00e3o em estudo<\/span><span style=\"font-weight: 400;\"> mais do que uma vari\u00e1vel para obter uma amostra t\u00e3o representativa quanto poss\u00edvel. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Por exemplo, para obter uma amostra representativa da popula\u00e7\u00e3o de um pa\u00eds, podemos ponderar uma s\u00e9rie de vari\u00e1veis demogr\u00e1ficas, como o sexo, a idade, a regi\u00e3o e o estrato social. <\/span><\/p>\n<p>Aprende sobre as vantagens e desvantagens da pondera\u00e7\u00e3o de dados e as carater\u00edsticas da pondera\u00e7\u00e3o raked.<\/p>\n<h2><span style=\"font-weight: 400;\">Exemplo de pondera\u00e7\u00e3o<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Imagina que temos uma popula\u00e7\u00e3o-alvo que est\u00e1 dividida uniformemente por g\u00e9nero. Se entrevistarmos uma amostra de 400 pessoas desta popula\u00e7\u00e3o, das quais 300 s\u00e3o homens e 100 s\u00e3o mulheres, ent\u00e3o saberemos que a nossa amostra representa demasiado os homens. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">A pondera\u00e7\u00e3o dos dados resultantes pode ajudar-nos a corrigir este desequil\u00edbrio. As propor\u00e7\u00f5es-alvo para homens e mulheres s\u00e3o de 50%. Por conseguinte, a propor\u00e7\u00e3o de homens teria de diminuir de 75% (300 em 400 entrevistas) para 50%, enquanto a propor\u00e7\u00e3o de mulheres teria de aumentar de 25% para 50%. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Neste caso, a pondera\u00e7\u00e3o multiplicaria os inqu\u00e9ritos \u00e0s mulheres por 2, de modo a que a resposta feminina fosse amplificada nos dados. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Por exemplo, na pergunta sobre o sexo, temos 100 pessoas que responderam ser do sexo feminino, mas ap\u00f3s a pondera\u00e7\u00e3o, este n\u00famero torna-se 200, uma vez que os dados sobre o sexo &#8220;feminino&#8221; s\u00e3o contados duas vezes. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Consequentemente, \u00e9 necess\u00e1rio reduzir os inqu\u00e9ritos aos homens. Neste caso, precisamos de obter 300 respostas para contar como 200, por isso multiplicamos os inqu\u00e9ritos aos homens por dois ter\u00e7os (ou 0,67). <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Antes da pondera\u00e7\u00e3o, temos 300 homens codificados na resposta sobre o g\u00e9nero. Multiplicando por dois ter\u00e7os, obtemos 200 homens, o que equivale ao n\u00famero de respostas femininas ap\u00f3s a pondera\u00e7\u00e3o. <\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Factores de pondera\u00e7\u00e3o<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Os n\u00fameros utilizados para multiplicar as respostas de cada propor\u00e7\u00e3o da amostra de investiga\u00e7\u00e3o foram <\/span><span style=\"font-weight: 400;\">amostra da investiga\u00e7\u00e3o<\/span><span style=\"font-weight: 400;\"> s\u00e3o chamados factores de pondera\u00e7\u00e3o. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Um fator de pondera\u00e7\u00e3o \u00e9 um peso dado a um ponto de dados para lhe atribuir uma maior ou menor import\u00e2ncia num grupo.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Os factores s\u00e3o utilizados na amostragem para fazer corresponder as amostras \u00e0 popula\u00e7\u00e3o.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Apresenta-se a seguir um resumo dos factores de pondera\u00e7\u00e3o para este exemplo:<\/span><\/p>\n<div class=\"tg-wrap\">\n<table style=\"border-collapse: collapse; border-spacing: 0; margin: 0px auto; table-layout: fixed; width: 629px;\"><colgroup> <col style=\"width: 88px;\" \/> <col style=\"width: 97px;\" \/> <col style=\"width: 116px;\" \/> <col style=\"width: 103px;\" \/> <col style=\"width: 109px;\" \/> <col style=\"width: 116px;\" \/><\/colgroup>\n<tbody>\n<tr>\n<th style=\"font-family: Arial, sans-serif; font-size: 18px; font-weight: bold; padding: 10px 5px; overflow: hidden; word-break: normal; background-color: #26ade4; color: #ffffff; text-align: center; border: 1px solid #000000;\" colspan=\"3\">Antes da pondera\u00e7\u00e3o<\/th>\n<th style=\"font-family: Arial, sans-serif; font-size: 18px; font-weight: bold; padding: 10px 5px; overflow: hidden; word-break: normal; background-color: #26ade4; color: #ffffff; text-align: center; vertical-align: top; border: 1px solid #000000;\" colspan=\"3\">Depois da pondera\u00e7\u00e3o<\/th>\n<\/tr>\n<tr>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; font-weight: bold; background-color: #ffffff; color: #000000; text-align: center; border: 1px solid inherit;\">Grupo<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; font-weight: bold; text-align: center; vertical-align: top; border: 1px solid black;\">N.\u00ba de entrevistas<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; font-weight: bold; text-align: center; vertical-align: top; border: 1px solid black;\">% da amostra<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; font-weight: bold; color: #000000; text-align: center; vertical-align: top; border: 1px solid inherit;\">N.\u00ba de entrevistas<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; font-weight: bold; text-align: center; vertical-align: top; border: 1px solid black;\">% da popula\u00e7\u00e3o-alvo<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; font-weight: bold; text-align: center; vertical-align: top; border: 1px solid black;\">Fator de pondera\u00e7\u00e3o<\/td>\n<\/tr>\n<tr>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; font-weight: bold; background-color: #ffffff; color: #000000; text-align: center; border: 1px solid inherit;\">Homens<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: center; vertical-align: top; border: 1px solid black;\">300<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: center; vertical-align: top; border: 1px solid black;\">75%<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; color: #000000; text-align: center; vertical-align: top; border: 1px solid inherit;\">200<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: center; vertical-align: top; border: 1px solid black;\">50%<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: center; vertical-align: top; border: 1px solid black;\">0.67<\/td>\n<\/tr>\n<tr>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; font-weight: bold; background-color: #ffffff; color: #000000; text-align: center; border: 1px solid inherit;\">Mulheres<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: center; vertical-align: top; border: 1px solid black;\">100<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: center; vertical-align: top; border: 1px solid black;\">25%<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; color: #000000; text-align: center; vertical-align: top; border: 1px solid inherit;\">200<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: center; vertical-align: top; border: 1px solid black;\">50%<\/td>\n<td style=\"font-family: Arial, sans-serif; font-size: 14px; padding: 10px 5px; overflow: hidden; word-break: normal; text-align: center; vertical-align: top; border: 1px solid black;\">2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><span style=\"font-weight: 400;\">Este \u00e9 um exemplo bastante simples, utilizado apenas para ilustrar o conceito de pondera\u00e7\u00e3o.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Recomenda\u00e7\u00f5es para a pondera\u00e7\u00e3o<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Na pr\u00e1tica, os analistas ponderam os dados dos inqu\u00e9ritos utilizando software especializado, como o <\/span><span style=\"font-weight: 400;\">SPSS.<\/span><span style=\"font-weight: 400;\"> No entanto, \u00e9 importante compreender os diferentes tipos de pondera\u00e7\u00e3o que existem e o efeito que a pondera\u00e7\u00e3o tem nos teus dados. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">A pondera\u00e7\u00e3o pode alterar negativamente a estrutura dos teus dados, pelo que deves ter cuidado ao aplic\u00e1-la. <\/span><b>cuidado ao aplic\u00e1-la<\/b><span style=\"font-weight: 400;\">. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">N\u00e3o \u00e9 aconselh\u00e1vel ampliar pequenos grupos de inquiridos de modo a que representem uma propor\u00e7\u00e3o significativa da amostra total, uma vez que isso significa que os resultados do inqu\u00e9rito s\u00e3o afectados de forma desproporcionada por uma pequena minoria de inquiridos.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Conclus\u00e3o<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Gostarias de conhecer as t\u00e9cnicas e ferramentas mais inovadoras do sector dos estudos de mercado? Descarrega a nossa <\/span><span style=\"font-weight: 400;\">Ebook Metodologias Avan\u00e7adas de Investiga\u00e7\u00e3o<\/span><span style=\"font-weight: 400;\"> e aprende uma vasta gama de m\u00e9todos de recolha de dados, l\u00f3gica de investiga\u00e7\u00e3o avan\u00e7ada, relat\u00f3rios, an\u00e1lises e muito mais. <\/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=pondera\u00e7\u00e3o\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>A pondera\u00e7\u00e3o \u00e9 uma t\u00e9cnica normalmente utilizada na amostragem estat\u00edstica para ajustar as amostras. Neste artigo, vais ficar a saber [&hellip;]<\/p>\n","protected":false},"author":42,"featured_media":1011525,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[2140],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>O que \u00e9 a pondera\u00e7\u00e3o e como aplic\u00e1-la?<\/title>\n<meta name=\"description\" content=\"Aprende sobre as utiliza\u00e7\u00f5es da pondera\u00e7\u00e3o e exemplos de como utilizar esta t\u00e9cnica estat\u00edstica. 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