主成分分析与聚类分析在民族分化研究中的应用比较

目的 比较主成分分析与聚类分析两种聚类方法对13个人群进行分类的结果。方法 采用两种数值分类方法并用Y染色体的12种单体型的双等位基因频率数据，对朝鲜族等13个人群进行分类，分析群体间,阐明民族的起源。结果 两种分类方法得到的结果不尽相同。主成分分析可以减少无关指标的影响，但是在简化数据降低维数的过程中又有可能丢失信息。聚类分析充分利用原始数据信息，但无法排除无关指标的“噪音”干扰。结论 主成分分析与聚类分析都适宜做多维复杂数据的分类研究，但在实际应用中，应运用两种分类方法得到的结果结合领域知识给出客观、合理的结论。

A Comparative Study of Population Differentiation by Using Principal Component Analysis And Cluster Analysis

Objective To compare the classification results by using principal component analysis and cluster analysis to classify 13 ethnic populations.Methods We used the two kinds of numerical taxonomy methods to analyze the Y chromosomal bialletic markers frequencies, so that we can explain the genetic relationship and the origin of ethnic groups.Results There is a little difference between the results of the two taxonomy methods ,principal component analysis can reduce the impact of irrelative characters ,but it might loss useful information on the course of simplifing data and reducing data dimension. Whereas, cluster analysis can take full advantage of initial data, it could not eliminate interfere from irrelative characters .Conclusion Principal component analysis and cluster analysis both are suitable for classification study to high dimension ,but we should give reasonable conclusion by combining genetic domain knowledge.