A Comparison of Graded Response and Rasch Partial Credit Models with Subjective Well-Being

Abstract

Two multiple category item response theory models are compared using a data set of 52 mood terms with 713 subjects. Tellegen’s (1985) model of mood with two independent, unipolar dimensions of positive and negative affect provided a theoretical basis for the assumption of unidimensionality. Principle components analysis and item parameter tests supported the unidimensionality assumption. Comparative model data fit for the Samejima (1969) logistic model for graded responses and the Masters (1982) partial credit model favored the former model for this particular data set. Theoretical and practical aspects of the comparative application of multiple category models in the measurement of subjective well-being or mood are discussed.