该文提出了计量测验效度的一种统一方法。
This paper put forward a general approach to measure test validity.
根据经典测量理论对代表测验长度与测验效度关系的公式进行分析和讨论，提出测验效度与长度关系的表达公式。
An analysis of formulas is made based on classical testing theories and a new formula is put forward to explain the relationship between test validity and test length.
目的：初步编制7～9年级数学成就测验，通过项目分析，信、效度检验等标准化过程。
Objective:The Mathematical Achievement Tests of the 7 ~ 9 Grades(the MATs) were formed, the items were analyzed, and the reliability and validities were tested.
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