Comparison of Scale Identification Methods in Mixture IRT Models

Youn Jeng Choi, Allan S. Cohen

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The effects of three scale identification constraints in mixture IRT models were studied. A simulation study found no constraint effect on the mixture Rasch and mixture 2PL models, but the item anchoring constraint was the only one that worked well on selecting correct model with the mixture 3PL model.

Original languageEnglish
Pages (from-to)1-26
Number of pages26
JournalJournal of Modern Applied Statistical Methods
Volume18
Issue number1
DOIs
StatePublished - 2020

Keywords

  • Bayesian estimation
  • Item response theory
  • MCMC
  • mixture models
  • scale identification

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