dif differential item functioning
dif differential item functioning
微分项目功能
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The detection of differential item functioning (dif) is crucial to ensuring the fairness of tests, which is an important approach to test if the item is biased or not.
项目功能差异(DIF)检验是保证测验公平性的需要，也是判别测验题目是否有偏差的重要步骤。
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