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A Comparison Of The Recovery Of Parameters Using The Nominal Response And Generalized Partial Credit Models, Christine E. Demars
A Comparison Of The Recovery Of Parameters Using The Nominal Response And Generalized Partial Credit Models, Christine E. Demars
Department of Graduate Psychology - Faculty Scholarship
In this simulation study, data were generated such that some items fit the generalized partial credit model (GPCM) while other items fit the nominal response model (NRM) but not the constraints of the GPCM. The purpose was to explore (a) how the errors in parameter estimation were affected by using the GPCM when the constraints of the GPCM were inappropriate, and (b) how the errors were affected by using the less-constrained NRM when the constraints of the GPCM were appropriate. With large sample sizes, there were considerable gains in precision from using the NRM when the GPCM was inappropriate, and …
Item Parameter Drift: The Impact Of The Curricular Area, Christine E. Demars
Item Parameter Drift: The Impact Of The Curricular Area, Christine E. Demars
Department of Graduate Psychology - Faculty Scholarship
The items from tests from two content areas, information literacy and global issues, were examined for item parameter drift across four years. The items on the information literacy test were expected to show more drift because the content of this field is changing more rapidly and because the test changed from low to high stakes for students while the other test remained low stakes. More items did show drift on the information literacy test, but the drift was not always readily explained. Further, some items did not fit the drift model available in BILOG-MG, either because the drift was a …