Objective: Explore the rationality of the data from cross, over trial in current document tested with Rank sun test for comparing different phases.

探讨现行文献中关于交叉试验资料比较阶段差别间的秩和检验方法的合理性。

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Condusion: The current method of Rank sun test for comparing different phases in cross-over trial should be improved.

结论：现行的交叉试验的秩和检验无法比较阶段间的差别，应予以改进。

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