Professor Carol Woods |
Department of Psychology, |
Title: Empirical Selection of Anchor Items for IRT-LR-DIF |
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Abstract: IRT-LR-DIF is a method used to evaluate the degree to which test
or questionnaire items are biased towards one group of people compared to another
group. Groups may be defined by gender, ethnicity, etc. IRT-LR-DIF requires
that a few items on the test have the same measurement properties in both
groups -- these are called anchor items. Many complicated and untested
procedures for empirically identifying anchor items are suggested in the
literature. In this talk, IRT-LR-DIF will be introduced, and a simple method
for empirically identifying anchor items that performs well in simulations
will be suggested. |