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.

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。

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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.

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。

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