Differential item functioning results may change depending on how an item is scored: An illustration with the Center for Epidemiologic Studies Depression Scale
Differential item functioning results may change depending on how an item is scored: An illustration with the Center for Epidemiologic Studies Depression Scale
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DOI：
10.1177/0013164402239317
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发表时间：
2003-02-01
影响因子：
2.7
通讯作者：
Zumbo, BD
中科院分区：
文献类型：
--
作者：
Gelin, MN;Zumbo, BD
本研究调查了流行病学研究中心抑郁症（CES-D）的潜在偏倚量表项目。使用两种二元方法（存在和持续）和一种顺序方法对20项CES-D进行评分。性别差异项目功能（DIF）进行了探讨，使用Zumbo的OLR方法与相应的逻辑回归效应大小估计与所有三种评分方法。性别差异被发现与CES-D项目"哭"的顺序和存在的评分方法。持久性评分方法确定了两个DIF项目（努力和希望）;然而，由于某些项目的变异性较低，这种评分方法的使用似乎有限。总体而言，结果表明评分方法对DIF有影响;因此，DIF是项目、评分方法和仪器目的的属性。
The present study investigated potentially biased scale items on the Center for Epidemiologic Studies Depression (CES-D). The 20-item CES-D was scored using two binary methods (presence and persistence) and one ordinal method. Gender differential item functioning (DIF) was explored using Zumbo's OLR method with corresponding logistic regression effect size estimator with all three scoring methods. Gender DIF was found with the CES-D item "crying" for the ordinal and presence methods of scoring. The persistence scoring method identified two DIF items (effort and hopeful); however, this scoring method appears to be of limited use due to low variability on some items. Overall, the results indicate that the scoring method has an effect on DIF; thus, DIF is a property of the item, scoring method, and purpose of the instrument.