1　引言　　等值 ,是以铆测验或铆被试组为桥梁建立两份同特质测验结果之间的比较关系。许多因素会影响等值的准确性 ,由于被试抽样给等值带来的误差叫等值抽样误差。它指的是 ,由于等值所用被试样本是从其总体中进行了不可避免的有一定程度偏性的抽样而得到的 ,据此建立的等值 1 Introduction Equivalent, riveted or riveted by the test group as a bridge to establish two comparative test results with traits. Many factors affect the accuracy of the equivalence, because the error caused by the sample sample to the equivalent is called the equivalent sampling error. It means that, since the sample to be used for equivalence is obtained from a sample of inevitably biased samples of its totality, the equivalent