Objective To compare power of the t - test and Wil coxon Rank - Sum test.

目的比较t检验与秩和检验检验完全随机设计两组资料的功效.

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Rank sum test is preferred.

非参数检验最好用秩和检验.

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Objective The rank sum test has more efficiency among the - parameter test, and also is frequently used.

目的秩和检验 是非 参数检验中检验效率比较高, 而且又是最常用的一种方法.

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