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ERIC Number: EJ890293
Record Type: Journal
Publication Date: 2010-Aug
Pages: 16
Abstractor: As Provided
Reference Count: 19
ISSN: ISSN-0013-1644
Using Cochran's Z Statistic to Test the Kernel-Smoothed Item Response Function Differences between Focal and Reference Groups
Zheng, Yinggan; Gierl, Mark J.; Cui, Ying
Educational and Psychological Measurement, v70 n4 p541-556 Aug 2010
This study combined the kernel smoothing procedure and a nonparametric differential item functioning statistic--Cochran's Z--to statistically test the difference between the kernel-smoothed item response functions for reference and focal groups. Simulation studies were conducted to investigate the Type I error and power of the proposed kernel-smoothed Cochran's Z. For the purpose of comparison, the Type I error and power rates with no correction and with regression correction were also include in the simulation. The results of this study suggest the Type I error and power performance of Cochran's Z improved when kernel smoothing was applied. (Contains 4 tables and 1 figure.)
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A