MULTILOG如何开展DIF(题目差异函数)分析，我看到国外有类似研究

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Differential Item Functioning in a Spanish Translation of the PTSD
Checklist: Detection and Evaluation of Impact


DIF Detection Within IRT
Within the IRT framework, there are essentially two approaches
to DIF analysis that vary both in the method of linking the two
groups being studied—one of the more challenging aspects of DIF
analysis—and in the identification of significant DIF.

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请问，已经得到了输出命令文件，怎么得到试题难度区分度等信息呢