The objective was to give out calculate formula of multilevel item information function, and give some examples of multilevel item information.
目的是给出多级评分项目的信息函数计算公式，同时通过几个实例讨论了多级评分项目信息函数在实践中的应用。
This paper analyses the meaning of the concepts in IRT such as information, item information function, scoring information function and their relations.
本文分析了信息函数、项目信息函数、评分信息函数等IRT中的重要概念的意义及其之间的联系。
The methods applied in data analysis are the analysis of item characteristic curve, item information function, test information function and item validity, as well as the checking of biased items.
质量评估的主要方法是对项目特征曲线、项目信息函数、测验信息函数、项目预测效度的分析和对项目偏差的检测。
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