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Despite the growing interest in the topic, there is no reliable tool to gauge Portuguese citizens\u2019 populist attitudes to date. The Populist Attitudes Scale (POP-AS), developed by Akkerman et al. [1], is one of the best-known instruments for measuring populist attitudes. However, no version for use in the Portuguese population is available. This paper describes the psychometric validation of the POP-AS for the Portuguese population.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Trustworthy measures of validity suggested by Boateng et al. [2] to address the psychometric features of the POP-AS were approached. A robust psychometrical pipeline evaluated the reliability, construct validity, cross national\/educational validity, and internal validity of the POP-AS.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>The Portuguese version of the POP-AS exhibited sound internal consistency and demonstrated adequate properties of validity: a one-factor model was obtained, revealing evidence of construct validity; invariance was ensured for education and partially ensured for the country; All the items of the POP-AS revealed relatively good values of discrimination and contributed adequately to the total score of the scale, ensuring evidence of internal validity.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>Psychometric analysis supports the POP-AS as a valid and reliable instrument for measuring populist attitudes among Portuguese citizens. A validation framework for measurement instruments in political science was proposed. Implications of the findings are discussed.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s40359-023-01118-1","type":"journal-article","created":{"date-parts":[[2023,4,4]],"date-time":"2023-04-04T11:09:37Z","timestamp":1680606577000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Empirical validation study and psychometric evaluation of the properties of the populist attitudes scale for the portuguese population"],"prefix":"10.1186","volume":"11","author":[{"given":"Filipe","family":"Falc\u00e3o","sequence":"first","affiliation":[]},{"given":"Carlos","family":"Jalali","sequence":"additional","affiliation":[]},{"given":"Patr\u00edcio","family":"Costa","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2023,3,31]]},"reference":[{"key":"1118_CR1","doi-asserted-by":"publisher","first-page":"1324","DOI":"10.1177\/0010414013512600","volume":"47","author":"A Akkerman","year":"2014","unstructured":"Akkerman A, Mudde C, Zaslove A. 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