Methods The data of resident's contacting infectious water were collected with cohort study, and were analyzed by sample cluster analysis (Q type).

方法采用队列随访调查的方法收集居民疫水暴露的情况，并用系统聚类法中样品聚类(Q型)进行聚类分析。

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Constellation diagram and contiguous vector diagram are audiovisual methods in multivariate statistics, they may be used for the cluster analysis of multivariate sample or index.

星座图与连接向量图是多变量统计的直观方法，可用于多变量样本或多变量指标的聚类分析。

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The types of electrofacies of standard sample beds from key well are classified by a combination of principal component and cluster analysis.

用主成分分析与聚类分析结合的方法划分关键井中标准样本层的测井相类型；

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