Open AccessComparison of Scale Identification Methods in Mixture IRT Models
Author(s) -
YounJeng Choi,
Allan S. Cohen
Publication year - 2020
Publication title -
journal of modern applied statistical methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.169
H-Index - 28
ISSN - 1538-9472
DOI - 10.22237/jmasm/1556669700
Subject(s) - rasch model , mixture model , mathematics , constraint (computer aided design) , scale (ratio) , identification (biology) , statistics , econometrics , physics , geometry , botany , quantum mechanics , biology
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.