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The Impact of Varied Discrimination Parameters on Mixed-Format Item Response Theory Model Selection

机译:各种区分参数对混合格式项目反应理论模型选择的影响

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Whittaker, Chang, and Dodd compared the performance of model selection criteria when selecting among mixed-format IRT models and found that the criteria did not perform adequately when selecting the more parameterized models. It was suggested by M. S. Johnson that the problems when selecting the more parameterized models may be because of the low variance of the discrimination parameters used to generate the data. This simulation study reproduced the Whittakeret al.study by incorporating more variability in the discrimination parameter estimates used to generate the data. The results indicated that the majority of the criteria performed more accurately when selecting the more parameterized models. Differences among the criteria performance under certain conditions and implications for model selection practice are discussed.
机译:Whittaker,Chang和Dodd在混合格式IRT模型中进行选择时比较了模型选择标准的性能,发现选择更多参数化模型时该标准不能充分发挥作用。 M. S. Johnson建议,选择更多参数化的模型时可能出现的问题可能是由于用于生成数据的判别参数的方差很小。该模拟研究通过在用于生成数据的判别参数估计中纳入更多可变性,从而再现了Whittakeret等人的研究。结果表明,在选择参数更多的模型时,大多数标准的执行更为准确。讨论了在特定条件下标准性能之间的差异以及对模型选择实践的影响。

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