Evidências preliminares de validade de versão reduzida da escala de compra por impulso de Rook e Fisher
Preliminary Evidence of Validity of the Reduced Version of Rook and Fisher’s Impulse Buying Scale
Tiago Azevedo Marot , Samuel Lincoln Bezerra Lins
Suma Psicológica, (2021), 28(2), pp. 112-119.
Recebido em 8 de março de 2021
Aceito em 25 de maio de 2021
Introdução: A redução de escalas visa a redução da quantidade de itens, mantendo-se suas qualidades psicométricas. O presente estudo teve como objetivo a redução da versão brasileira da escala de compra por impulso de Rook e Fisher. Método: Participaram do estudo 1173 brasileiros, sendo 868 mulheres e 305 homens com a média de idade de 24.8 anos e desvio-padrão de 12.7. Todos os participantes foram contatados via redes sociais ou e-mail. A pesquisa foi dividida em três estudos. Resultados: No primeiro estudo, a estrutura unifatorial do instrumento foi corroborada, uma vez que a análise paralela sugeriu a retenção de um fator e os índices de ajuste foram acima de .95. Foram selecionados quatro itens para comporem a versão reduzida. O segundo estudo analisou a estrutura interna e as cargas fatoriais da escala reduzida por meio da análise fatorial exploratória e da análise fatorial confirmatória. Os resultados da análise fatorial exploratória foram semelhantes aos do estudo 1 e a análise fatorial confirmatória também apresentou índices de ajuste acima de .90. No terceiro estudo foram realizadas correlações para verificar o grau de diferença das correlações entre a escala reduzida e a original. Foram obtidas evidências de validade preditiva com as escalas de materialismo, consumo de status e propensão ao endividamento. Ainda, realizou-se uma análise fatorial confirmatória multigrupo que verificou a invariância do instrumento entre homens e mulheres. Conclusão: Conclui-se que a escala reduzida de compra por impulso, 4-CI, é considerada adequada para a mensuração desse construto.
Palavras-chave:
Compra por impulso, versão reduzida, análise fatorial confirmatória multigrupo, endividamento, materialismo
Introduction: Scale reduction aims the reduction of the number of the items maintaining its psychometric properties. The goal of this study was to reduce the Brazilian version of Rook and Fisher’s impulsive buying scale. Method: Participants were 1173 Brazilians, in which 868 were women and 305 were men with mean of age of 24.8 years old and a standard deviation of 12.7. All participants were recruited via social media or e-mail. The research was split in three. Results: In the first study, the unifactorial structure was supported, once the parallel analysis suggested the retention of one factor, and the fit indexes were superior to .95. Four items were selected to form the reduced version. The second study analyzed the internal structure and the factorial loadings of the reduced scale through exploratory factor analysis and confirmatory factor analysis. The results from the exploratory factor analysis were similar to those of study 1 and the confirmatory factor analysis also showed fit indexes above .90. In the third study, correlation analysis were run to verify the disparities between the reduced and the original scale. Predictive validity evidence was gathered with the materialism, consumption by status, and propension to indebtedness. Still, a multigroup confirmatory factor analysis verified the instrument invariance between men and women. Conclusion: It is concluded that the reduced impulsive buying scale, 4-CI, is considered adequate to the measurement of this construct.
Keywords:
Impulsive buying, brief version, multigroup confirmatory factor analysis, indebtedness, materialism
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