The Rating Scale Model for Objective Measurement
نویسندگان
چکیده
Necessary and sufficient relations between measurement objectivity and psychometric models for data in more than two categories are reviewed and extended. Rasch (1960, 1961) and others prove the sufficiency of Rasch models for objectivity. Douglas and Wright (1986) derive the model necessary for objectivity for data in two categories. Rasch (1968) outlines a proof of the model necessary for observations in any number of categories but does not deal with the unidimensional rating scale model. This paper completes Rasch's proof, interprets the structural characteristics of his model and shows that it is the only rating scale model which produces the measurement objectivity necessary for scientific comparisons.
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