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２成组比较资料显著性检验２．１两样本比较的秩和检验法两样本比较的秩和检验法，是利用两样本观察值的秩来推断两样本分别代表的总体的分布是否相同。该方法相当于检验两个独立样本平均数之差异的ｔ检验法。当两个独立样本不符合ｔ检验法的基本假设时，可以选用两样本比较的
2 group comparison test significance test 2.1 two sample comparison rank sum test two sample comparison rank sum test is the use of two sample observation rank to infer whether the two samples represent the overall distribution of the same. This method is equivalent to the t-test, which tests the difference between the means of two independent samples. When two independent samples do not meet the basic assumption of the t-test, two samples can be selected for comparison