00922nas a2200121   4500008003900000245007500039210006900114300001200183490000700195520052700202100001800729856005300747       2012                          d00aThe Problem of Bias in Person Parameter Estimation in Adaptive Testing0 aProblem of Bias in Person Parameter Estimation in Adaptive Testi  a255-2700 v363 a<p>It is shown that deviations of estimated from true values of item difficulty parameters, caused for example by item calibration errors, the neglect of randomness of item difficulty parameters, testlet effects, or rule-based item generation, can lead to systematic bias in point estimation of person parameters in the context of adaptive testing. This effect occurs even when the errors of the item difficulty parameters are themselves unbiased. Analytical calculations as well as simulation studies are discussed.</p>
1 aDoebler, Anna  uhttp://apm.sagepub.com/content/36/4/255.abstract