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Some Considerations on the Partial Credit Model

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Author(s): Verstralen, H.H.F.M. | Verhelst, N.D.

Journal: Psicológica
ISSN 0211-2159

Volume: 29;
Issue: 2;
Start page: 229;
Date: 2008;
Original page

ABSTRACT
The Partial Credit Model (PCM) is sometimes interpreted as a model for stepwise solution of polytomously scored items, where the item parameters are interpreted as diculties of the steps. It is argued that this interpretation is not justi ed. A model for stepwise solution is discussed. It is shown that the PCM is suited to model sums of binary responses which are not supposed to be stochastically independent. As a practical result, a statistical test of stochastic independence in the Rasch model is derived
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