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。
The analysis of spearman rank correlation showed that there were correlations among risk behaviors.
等级相关分析表明：多种不良行为之间存在相关关系。
Likelihood ratio test, rank correlation analysis and principal component analysis were used to investigate the optimal model of function and the index system.
似然比检验、秩相关分析、主成分分析等方法相继用于研究函数的最适模型和指标体系。
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