Zhuangzhuang Han, Sandip Sinharay, Matthew S Johnson, Xiang Liu
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引用次数: 1
Abstract
The S-X2 statistic (Orlando & Thissen, 2000) is popular among researchers and practitioners who are interested in the assessment of item fit. However, the statistic suffers from the Chernoff-Lehmann problem (Chernoff & Lehmann, 1954) and hence does not have a known asymptotic null distribution. This paper suggests a modified version of the S-X2 statistic that is based on the modified Rao-Robson χ2 statistic (Rao & Robson, 1974). A simulation study and a real data analyses demonstrate that the use of the modified statistic instead of the S-X2 statistic would lead to fewer items being flagged for misfit.
期刊介绍：
Applied Psychological Measurement publishes empirical research on the application of techniques of psychological measurement to substantive problems in all areas of psychology and related disciplines.
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