碩士 / 國立中正大學 / 心理學研究所 / 100 / It is common practice in item response theory (IRT) to consider items as fixed effects and persons as random effects. Theoretically, items can be treated as random effects as well. Many studies on the assessment of differential item functioning (DIF) treat items as fixed effects. Few studies treat items as random effects; however, they didn’t manipulate all possible DIF type and high DIF percentage, and the DIF detection method they used was not easy to be implemented for practical users. Therefore, the aim of this study was to investigate the efficiency of DIF assessment for dichotomous items with random item effects via Mantel-Haenszel (Holland & Thayer, 1988; Mantel & Haenszel, 1959) and the Logistic Regression (Swaminathan & Rogers, 1990) methods. The results of random item effects were compared with those of fixed item effects in this study. The results showed the powers of DIF detection for both item effects were similar. However, the type I error of random item effects deviated 0.05 much more than that of fixed item effects. When the mean item difficulty difference (MIDD) smaller than 0.04, both item effects showed similar results in type I error and power of one-stage DIF detection methods. When MIDD was greater than 0.06, the type I error of one-stage DIF detection methods inflated significantly for both item effects; however, scale purification could reduce the inflated type I error. This study investigated the DIF detection under the random item effects and fixed item effects simultaneously, and the simulations were manipulated to real situation. Hence, the results from the study are expected to facilitate the understanding and the explanation of the DIF assessment when the items come from a distribution in practice.
| Identifer | oai:union.ndltd.org:TW/100CCU00071017 |
| Date | January 2012 |
| Creators | Shih-Chiang Kao, 高世強 |
| Contributors | 蘇雅蕙 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 104 |
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