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.

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