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Evaluation of the 0.3 Logits Screening Criterion in Common Item Equating

机译:通用项目等式中0.3 Logits筛选标准的评估

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摘要

A number of state assessment programs that employ Rasch-based common item equating procedures estimate the equating constant with only those common items for which the two tests' Rasch item difficulty parameter estimates differ by less than 0.3 logits. The results of this study presents evidence that this practice results in an inflated probability of incorrectly dropping an item from the common item set if the number of examinees is small (e.g., 500 or less) and the reverse if the number of examinees is large (e.g., 5000 or more). An asymptotic experiment-wise error rate criterion was algebraically derived. This same criterion can also be applied to the Mantel-Haenszel statistic. Bonferroni test statistics were found to provide excellent approximations to the (asymptotically) exact test statistics.
机译:许多采用基于Rasch的通用项目等同程序的状态评估程序仅使用两个测试的Rasch条目难度参数估计值相差小于0.3 logit的那些通用项目来估计等同常数。这项研究的结果表明,如果考生人数少(例如500名或更少),则这种做法会导致错误地从通用项目集中删除某项的可能性增加;而如果考生人数多(如果该数不多,则相反)例如5000或更多)。通过代数推导了一个渐近的实验方向错误率准则。相同的标准也可以应用于Mantel-Haenszel统计数据。发现Bonferroni测试统计数据可以很好地近似(渐近地)精确的测试统计数据。

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