Investigating the Impact of Uncertainty About Item Parameters on Ability Estimation

Investigating the Impact of Uncertainty About Item Parameters on Ability Estimation
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研究项目参数的不确定性对能力估计的影响

DOI:
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发表时间:
2011
期刊:
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通讯作者:
T. Lu
T. Lu
中科院分区:
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文献类型:
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作者:
Jinming Zhang;Min‐ge Xie;Xiaolan Song;T. Lu

文献摘要

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导出了考生能力的最大似然估计量(MLE)和加权似然估计量(WLE)的渐近展开,而项目参数估计量被视为带有误差测量的协变量。渐近公式表示由于项目参数估计量的不确定性而导致的能力估计量的偏差量。给出一个数值例子来说明如何应用公式来评估项目参数的不确定性对能力估计的影响以及使用常规MLE或WLE方法估计能力的适当性。
Asymptotic expansions of the maximum likelihood estimator (MLE) and weighted likelihood estimator (WLE) of an examinee’s ability are derived while item parameter estimators are treated as covariates measured with error. The asymptotic formulae present the amount of bias of the ability estimators due to the uncertainty of item parameter estimators. A numerical example is presented to illustrate how to apply the formulae to evaluate the impact of uncertainty about item parameters on ability estimation and the appropriateness of estimating ability using the regular MLE or WLE method.