条目反应理论认为，每个测验条目有其自身固有的特征，比如难度、区分度等，这些特征与样本无关，也与其它条目无关。
Item Response Theory takes the hypothesis that every test item has its own features such as difficulty, discrimination and others, which are not related to the sample and neither to other items.
为试题设置了知识点、难度、区分度等参数，为智能组卷策略的实现和试卷分析提供了必要的参考依据；
And it also sets the necessary parameters of questions, difficulties, differences and provides the references for realizing the intelligent combination and analyzing of test paper.
在试题质量分析的基础上，对试题的难度、区分度、信度和效度建立了定量评价模型。
Based on the analysis of test paper quality, this paper constructs the evaluation model for difficult degree, differentiating degree, confident degree and effective degree of test paper.
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