参数检验的方法 ,尤其是对计量资料 ,需要对研究的总体作一些比较严格的假定。例如 t检验法要求总体分布是正态分布等。在实际工作中的许多资料不符合这种要求 ,因此以上的参数检验方法的使用受到了限制。　　近代统计学家发明了对总体分布不必作限制性假定的检验技术 ,这种技? The method of parameter test, especially for the measurement data, needs to make some more strict assumptions on the overall study. For example, the t test requires that the overall distribution be normal distribution. Many of the data in actual work do not meet this requirement, so the use of the above parameter test methods is limited. Modern statisticians have invented the test technique that does not have to be restrictive assumptions for the overall distribution.