Because some products show no failure in the random truncation test period, this paper USES the mean rank order method to calculate the empirical cumulative distribution function.

考虑随机截尾试验中有些试验产品无故障数据出现，提出采用平均秩次法计算经验分布函数。

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Based on the condition, to adjust rank order with semiparametric method for statistical inference is more reasonable in two sample rank test.

根据这一情况，本文用半参数方法来校正秩次，使两组秩和检验的统计推断更为合理。

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Rank correlation analyses show that all of the runoff sequence change with tendency, and the sudden change appeared in 1948, as concluded by order cluster analysis method.

用秩次相关分析法检验得出灞河出山径流序列均存趋势性，用有序聚类分析法分析得出灞河出山径流序列的突变年份是1948年。

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