Empirical Selection of Anchors for Tests of Differential Item Functioning
Empirical Selection of Anchors for Tests of Differential Item Functioning
复制标题
用于差异项功能测试的锚点的实证选择
DOI：
10.1177/0146621607314044
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发表时间：
2009
影响因子：
1.2
通讯作者：
Carol M. Woods
中科院分区：
文献类型：
--
作者：
Carol M. Woods
差异项目功能（DIF）发生在测试或问卷上的项目对于一组人与另一组人具有不同的测量属性时，无论结构上的组平均差异如何。测试DIF的方法需要根据对结构的估计来匹配不同群体的成员。优选地，该估计基于被称为指定锚的组不变项的子集。在这项研究中，提出了一个快速和简单的策略，经验选择指定的锚，并在模拟评估。虽然提出的基于秩的方法适用于任何方法的DIF测试，本文重点介绍嵌套两组项目反应模型之间的似然比（LR）的比较。基于排名的策略经常确定一个组不变的指定锚集，产生更准确的LR测试结果比那些使用所有其他项目作为锚。随着功能差异项目的百分比增加，组不变锚点更难识别。为从业者提供建议。
Differential item functioning (DIF) occurs when items on a test or questionnaire have different measurement properties for one group of people versus another, irrespective of group-mean differences on the construct. Methods for testing DIF require matching members of different groups on an estimate of the construct. Preferably, the estimate is based on a subset of group-invariant items called designated anchors. In this research, a quick and easy strategy for empirically selecting designated anchors is proposed and evaluated in simulations. Although the proposed rank-based approach is applicable to any method for DIF testing, this article focuses on likelihood-ratio (LR) comparisons between nested two-group item response models. The rank-based strategy frequently identified a group-invariant designated anchor set that produced more accurate LR test results than those using all other items as anchors. Group-invariant anchors were more difficult to identify as the percentage of differentially functioning items increased. Advice for practitioners is offered.
影响因子：
22.4
作者：
REISE, SP;WIDAMAN, KF;PUGH, RH
通讯作者：
PUGH, RH