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作者讨论了观测数据的独立性对统计结论的重要影响，给出了检验独立性的非参数检方法，便于医学科研人员有效地使用统计方法解决问题。
The author discusses the important influence of the independence of observation data on statistical conclusions, and provides a non-parametric detection method for testing independence, so that medical researchers can effectively use statistical methods to solve problems.