

{"id":1011691,"date":"2021-11-19T02:00:27","date_gmt":"2021-11-19T09:00:27","guid":{"rendered":"https:\/\/www.questionpro.com\/blog\/analise-fatorial-o-que-e-e-que-tipos-existem\/"},"modified":"2025-02-18T10:55:17","modified_gmt":"2025-02-18T17:55:17","slug":"analise-fatorial-o-que-e-e-que-tipos-existem","status":"publish","type":"post","link":"https:\/\/www.questionpro.com\/blog\/pt\/analise-fatorial-o-que-e-e-que-tipos-existem\/","title":{"rendered":"An\u00e1lise fatorial: o que \u00e9 e que tipos existem?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">A <\/span><b>an\u00e1lise de factores<\/b><span style=\"font-weight: 400;\"> sofreu numerosos desenvolvimentos e m\u00e9todos de c\u00e1lculo. Embora tenha sido utilizado pela primeira vez por psicometristas, o seu campo de aplica\u00e7\u00e3o foi alargado a muitos outros dom\u00ednios, como a geologia, a medicina e as finan\u00e7as. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">A an\u00e1lise fatorial \u00e9 uma t\u00e9cnica estat\u00edstica que, atualmente, \u00e9 utilizada principalmente para <\/span><span style=\"font-weight: 400;\">analisar inqu\u00e9ritos<\/span><span style=\"font-weight: 400;\">. Permite, quando temos uma popula\u00e7\u00e3o de indiv\u00edduos sobre a qual dispomos de muita informa\u00e7\u00e3o relativa a opini\u00f5es, pr\u00e1ticas e estatuto (sexo, idade, etc.), ver as semelhan\u00e7as e as oposi\u00e7\u00f5es entre as carater\u00edsticas dos indiv\u00edduos. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Por exemplo, ao aplicar um <\/span><span style=\"font-weight: 400;\">inqu\u00e9rito de satisfa\u00e7\u00e3o<\/span><span style=\"font-weight: 400;\"> vais recolher um grande n\u00famero de vari\u00e1veis ao mesmo tempo. Queremos saber se as perguntas do question\u00e1rio est\u00e3o agrupadas de alguma forma carater\u00edstica. Atrav\u00e9s desta an\u00e1lise, podemos encontrar grupos de vari\u00e1veis nas respostas dos inquiridos que tenham um significado comum e, assim, reduzir o n\u00famero de dimens\u00f5es necess\u00e1rias para explicar as respostas recebidas. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Vamos saber mais sobre as suas carater\u00edsticas e os tipos que existem.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">O que \u00e9 a an\u00e1lise fatorial?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">A an\u00e1lise fatorial \u00e9 a an\u00e1lise que revela as rela\u00e7\u00f5es entre as vari\u00e1veis e, em geral, a compreens\u00e3o dos dados modelados.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Esta an\u00e1lise faz parte do modelo linear generalizado (GLM) e este m\u00e9todo tamb\u00e9m assume v\u00e1rios pressupostos: existe uma rela\u00e7\u00e3o linear, n\u00e3o existe multicolinearidade, inclui as vari\u00e1veis relevantes na an\u00e1lise e existe uma correla\u00e7\u00e3o entre as vari\u00e1veis e os factores.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Esta an\u00e1lise pode ser uma an\u00e1lise explorat\u00f3ria ou de verifica\u00e7\u00e3o.<\/span><\/p>\n<p>\u00a0<\/p>\n<blockquote>\n<h2><span style=\"font-weight: 400;\">Porqu\u00ea utilizar a an\u00e1lise fatorial?<\/span><\/h2>\n<\/blockquote>\n<p><span style=\"font-weight: 400;\">A an\u00e1lise fatorial \u00e9 uma ferramenta \u00fatil para investigar as rela\u00e7\u00f5es entre<\/span><b> investigar as rela\u00e7\u00f5es entre vari\u00e1veis<\/b><span style=\"font-weight: 400;\"> de conceitos complexos, como o estatuto socioecon\u00f3mico ou escalas psicol\u00f3gicas.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Permite a investiga\u00e7\u00e3o de conceitos que n\u00e3o s\u00e3o f\u00e1ceis de medir diretamente, reduzindo um grande n\u00famero de vari\u00e1veis a alguns factores subjacentes interpret\u00e1veis.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">M\u00e9todos de an\u00e1lise de factores<\/span><\/h2>\n<p>\u00a0<\/p>\n<p><span style=\"font-weight: 400;\">Existem diferentes tipos de m\u00e9todos utilizados para extrair o fator do conjunto de dados:<\/span><\/p>\n<ol>\n<li><b> An\u00e1lise de componentes principais: <\/b><span style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Este \u00e9 o m\u00e9todo mais utilizado pelos investigadores. Come\u00e7a por extrair a vari\u00e2ncia m\u00e1xima e coloca-a no primeiro fator. \u00a0 Em seguida, elimina a vari\u00e2ncia explicada pelos primeiros factores e come\u00e7a a extrair a vari\u00e2ncia m\u00e1xima para o segundo fator. Este processo vai at\u00e9 ao \u00faltimo fator.<\/span><\/span>\n<p>\u00a0<\/p>\n<\/li>\n<li><b> An\u00e1lise comum<\/b><span style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">O segundo m\u00e9todo mais preferido pelos investigadores, extrai a vari\u00e2ncia comum e coloca-a em factores. Este m\u00e9todo n\u00e3o inclui a vari\u00e2ncia \u00fanica de todas as vari\u00e1veis.<\/span><\/span>\n<p>\u00a0<\/p>\n<\/li>\n<li><b> Factoriza\u00e7\u00e3o de imagens:<\/b><span style=\"font-weight: 400;\"><span style=\"font-weight: 400;\"> Este m\u00e9todo baseia-se na matriz de correla\u00e7\u00e3o. O m\u00e9todo de regress\u00e3o \u00e9 utilizado para prever o fator na factoriza\u00e7\u00e3o da imagem.<\/span><\/span>\n<p>\u00a0<\/p>\n<\/li>\n<li><b> M\u00e9todo da semelhan\u00e7a m\u00e1xima: <\/b><span style=\"font-weight: 400;\">Este m\u00e9todo tamb\u00e9m funciona com base na m\u00e9trica de correla\u00e7\u00e3o, mas utiliza o m\u00e9todo da m\u00e1xima semelhan\u00e7a para a factoriza\u00e7\u00e3o.<\/span><\/li>\n<\/ol>\n<h2><span style=\"font-weight: 400;\">Modelos de an\u00e1lise fatorial<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Vamos conhecer algumas das carater\u00edsticas dos tipos de an\u00e1lise fatorial:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>An\u00e1lise explorat\u00f3ria de factores:<\/b><span style=\"font-weight: 400;\"><span style=\"font-weight: 400;\"> Parte do princ\u00edpio de que qualquer indicador ou vari\u00e1vel pode ser associado a qualquer fator. \u00c9 a an\u00e1lise fatorial mais utilizada pelos investigadores e n\u00e3o se baseia em nenhuma teoria pr\u00e9via.<\/span><\/span>\n<p>\u00a0<\/p>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>An\u00e1lise fatorial confirmat\u00f3ria<\/b><span style=\"font-weight: 400;\">\u00c9 utilizada para determinar o fator e as cargas factoriais das vari\u00e1veis medidas e para confirmar o que se espera da teoria b\u00e1sica ou pr\u00e9-estabelecida. A AFC pressup\u00f5e que cada fator est\u00e1 associado a um subconjunto espec\u00edfico de vari\u00e1veis medidas. Utiliza normalmente duas abordagens: <\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Aplica uma an\u00e1lise fatorial, por exemplo, para descobrir os<\/span><span style=\"font-weight: 400;\"> o <\/span><span style=\"font-weight: 400;\">processo de decis\u00e3o de compra <\/span> <span style=\"font-weight: 400;\">de um cliente. Podes analisar diferentes tipos de vari\u00e1veis, desde as emocionais \u00e0s econ\u00f3micas e sociais, para uma melhor interpreta\u00e7\u00e3o dos resultados. <\/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=an\u00e1lise-fatorial\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 an\u00e1lise de factores sofreu numerosos desenvolvimentos e m\u00e9todos de c\u00e1lculo. Embora tenha sido utilizado pela primeira vez por psicometristas, [&hellip;]<\/p>\n","protected":false},"author":42,"featured_media":949403,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"An\u00e1lise fatorial","_yoast_wpseo_title":"An\u00e1lise fatorial: o que \u00e9 e que tipos existem?","_yoast_wpseo_metadesc":"Aprende o que \u00e9 a an\u00e1lise fatorial, quais os m\u00e9todos existentes e como utiliz\u00e1-la para analisar os resultados do teu inqu\u00e9rito.","_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":[2143,2140],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>An\u00e1lise fatorial: o que \u00e9 e que 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