Published online by Cambridge University Press: 01 January 2025
In item response theory (IRT), it is often necessary to perform restricted recalibration (RR) of the model: A set of (focal) parameters is estimated holding a set of (nuisance) parameters fixed. Typical applications of RR include expanding an existing item bank, linking multiple test forms, and associating constructs measured by separately calibrated tests. In the current work, we provide full statistical theory for RR of IRT models under the framework of pseudo-maximum likelihood estimation. We describe the standard error calculation for the focal parameters, the assessment of overall goodness-of-fit (GOF) of the model, and the identification of misfitting items. We report a simulation study to evaluate the performance of these methods in the scenario of adding a new item to an existing test. Parameter recovery for the focal parameters as well as Type I error and power of the proposed tests are examined. An empirical example is also included, in which we validate the pediatric fatigue short-form scale in the Patient-Reported Outcome Measurement Information System (PROMIS), compute global and local GOF statistics, and update parameters for the misfitting items.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11336-019-09667-4) contains supplementary material, which is available to authorized users.
The authors would like to thank Dr. David Thissen from the Department of Psychology at the University of North Carolina at Chapel Hill for his feedback and suggestions about this work. The participation of Ji Seung Yang was supported by the National Science Foundation under Grant EHR-1534846. The participation of Alberto Maydeu-Olivares was supported by the National Science Foundation under Grant SES-1659936.