Further investigation of the performance of S-X2:: An item fit index for use with dichotomous item response theory models
Further investigation of the performance of S-X2:: An item fit index for use with dichotomous item response theory models
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DOI：
10.1177/0146621603027004004
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发表时间：
2003-07-01
影响因子：
1.2
通讯作者：
Thissen, D
中科院分区：
文献类型：
--
作者：
Orlando, M;Thissen, D
本研究对S-X-2作为二分项目反应理论模型的项目拟合指数的效用提出了新的发现。结果是基于模拟研究，其中项目响应生成和校准的100个测试下的27个条件。计算每个项目的项目拟合指数S-X-2和Q（1）- X-2.根据两个指标的命中率和误报率构建ROC曲线。对这些曲线的检查表明，一般来说，S-X-2的性能随着试验长度和样本量的增加而提高。S-X-2的性能在大多数条件下上级QI-X-2，但并非所有条件下都是如此.从这项研究的结果意味着，S-X-2可能是一个有用的工具，在检测一个项目中包含的一个项目的失配，否则拟合良好的测试，贷款额外的支持与二分项目反应理论模型使用的指数的效用。
This study presents new findings on the utility of S - X-2 as an item fit index for dichotomous item response theory models. Results are based on a simulation study in which item responses were generated and calibrated for 100 tests under each of 27 conditions. The item fit indices S - X-2 and Q(1) - X-2 were calculated for each item. ROC curves were constructed based on the hit and false alarm rates of the two indices. Examination of these curves indicated that in general, the performance of S - X-2 improved with test length and sample size. The performance of S - X-2 was superior to that of Q I - X-2 under most but not all conditions. Results from this study imply that S - X-2 may be a useful tool in detecting the misfit of one item contained in an otherwise well-fitted test, lending additional support to the utility of the index for use with dichotomous item response theory models.