The Nature of Objectivity with the Rasch Model.
MINNESOTA UNIV MINNEAPOLIS CENTER FOR THE STUDY OF ORGANIZATIONAL PERFORMANCE AND HUMAN EFFECTIVENESS
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Although it has been claimed that the Rasch model leads to a higher degree of objectivity in latent trait and ability measurement than has been previously possible, the model has had little impact on test development. Population-invariant item and ability calibrations along with the statistical equivalency of any two item subsets are supposedly possible if the item pool has been calibrated by the Rash model. Initial research has been encouraging, but the relation of underlying assumptions and computations in the Rasch model to trait theory and trait measurement has not been clear from previous work. The current paper presents an analysis of the conditions under which the claims of objectivity will be substantiated, with special emphasis on the nature of equivalent forms. It is concluded that the real advantages of the Rasch model will not be apparent until the technology of trait measurement becomes more sophisticated. Author