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Direct linkHarel, Daphna; Steele, Russell J. – Journal of Educational and Behavioral Statistics, 2018
Collapsing categories is a commonly used data reduction technique; however, to date there do not exist principled methods to determine whether collapsing categories is appropriate in practice. With ordinal responses under the partial credit model, when collapsing categories, the true model for the collapsed data is no longer a partial credit…
Descriptors: Matrices, Models, Item Response Theory, Research Methodology
