Partial Credit Model

Geoff N Masters

46 citations0/0 files storedEncyclopedia of Social Measurement

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Psychometric Methodologies and Testing Psychological Testing and Assessment Educational Assessment and Pedagogy

Abstract

The partial credit model (PCM) is a model for constructing measures using items with two or more ordered response categories; that is, items scored polytomously. The model is a simple application of Rasch’s model for dichotomies (Volume One,Chapter 3). Specifically, if responses to itemi are recorded in categories a = 0, 1, …Ai , then the probability of a person’s response to itemi being in categoryx rather than in categoryx − 1 is modeled by the PCM, as being governed by Rasch’s model for dichotomies.

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References

1982A Rasch Model for Partial Credit Scoring 1992A Generalized Partial Credit Model: Application of an EM Algorithm 1984The Essential Process in a Family of Measurement Models 1982An Extension of the Rasch Model for Ratings Providing Both Location and Dispersion Parameters 1998Outcomes of learning 1987Calibrating graded assessments: Rasch partial credit analysis of performance in writing 1988The Analysis of Partial Credit Scoring 1989Extensions of the Partial Credit Model

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