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Interpreting the relationship between item difficulty and DIF: examples from educational testing

机译:解释项目难度与DIF的关系:来自教育测试的示例

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The investigation of differential item functioning (DIF) is commonplace in educational testing. Most often it results in no more than the discarding of a proportion of the developed items. Apart from the potential threat to validity of the instrument due to differential loss of certain types of items, this also is inefficient in terms of item development costs. This paper discusses certain situations where particular patterns of non-uniform DIF can be related to item difficulty, and modelled by enhanced Rasch models. This allows for a more efficient usage of items, as well as, potentially, an improved understanding of the complexities of how educational tests function across different sub-populations.
机译:差分项目功能(DIF)的调查是教育测试中的常见。 最常见的是,它不会超过丢弃开发项目的比例。 除了由于某些类型的物品的差异损失导致仪器有效性的潜在威胁,这也效率低于项目开发成本。 本文讨论了某些情况,其中非均匀DIF的特定模式可以与项目难度有关,并通过增强的RASCH模型进行建模。 这允许更有效地使用项目,以及潜在地,改善对教育测试如何跨越不同子群体的复杂性的了解。

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