An efficient method for classifying perfectionists

Multiple samples of university students (N = 1,537) completed the Almost Perfect Scale-Revised (APS-R; R. B. Slaney, M. Mobley, J. Trippi, J. Ashby, & D. G. Johnson, 1996). Cluster analyses, cross-validated discriminant function analyses, and receiver operating characteristic curves for sensitivity and specificity of APS-R scores were used to derive efficient and straightforward calculations and decision rules for classifying students as perfectionists (and as either adaptive or maladaptive). Convergent validity of the cutoff scores for group membership was supported by expected group differences on other measures of perfectionism. Criterion-related (concurrent) validity of the classification scheme was supported by comparison of groups on measures of depression, life satisfaction, and grade point average. The cutoffs and decision rules should prove useful in applied or future research situations in which differentiation of perfectionists and nonperfectionists is desired.