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Multilevel Irt: When Is Local Independence Violated?, Christine E. Demars, Jessica Jacovidis
Multilevel Irt: When Is Local Independence Violated?, Christine E. Demars, Jessica Jacovidis
Department of Graduate Psychology - Faculty Scholarship
Calibration data often is often collected within schools. This illustration shows that random school effects for ability do not bias IRT parameter estimates or their standard errors. However, random school effects for item difficulty lead to bias in item discrimination estimates and inflated standard errors for difficulty and ability.