Linking Parameter Estimates Derived From an Item Response Model Through Separate Calibrations GPCM IRT
Haberman, Shelby J.
- Publication Year:
- Report Number:
ETS Research Report
- Document Type:
- Page Count:
- Subject/Key Words:
Generalized Partial-Credit Model (GPCM),
Two-Parameter Logistic Model,
Item Response Theory (IRT)
A regression procedure is developed to link simultaneously a very large number of item response
theory (IRT) parameter estimates obtained from a large number of test forms, where each form
has been separately calibrated and where forms can be linked on a pairwise basis by means of
common items. An application is made to forms in which a two-parameter logistic model is
applied to dichotomous items and a general partial credit model is applied to polytomous items.