Some considerations on the Partial Credit Model

Authors

  • Norman D. Verhelst National Institute for Educational Measurement (Cito), The Netherlands
  • H.H.F.M. Verstralen National Institute for Educational Measurement (Cito), The Netherlands

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 difficulties of the steps. It is argued that this interpretation is not justified. 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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Published

2008-10-22

Issue

Vol 29, No 2 (2008)

Section

Methodology Section

License

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