Effects of item type and estimation method on the accuracy of estimated personality trait scores: Polytomous item response theory models versus summated scoring

In this study personality scale validity was compared using a variety of estimation methods (CTT, adjusted-CTT, SGR, GGUM) and item types (monotonic vs. non-monotonic) for the traits of conscientiousness and extraversion. Regardless of item type or estimation method, trait estimates were highly correlated. Using job performance ratings as an external criterion within the nomological network of these traits, model fit was not related to scale validity, and all estimation procedures resulted in comparable validity coefficients. Implications are discussed.
Source: Personality and Individual Differences - Category: Psychiatry & Psychology Source Type: research