Thirdly, taking southern California theme parks cluster as a case, we calculate their niche by principle components analysis utilizing the model. 以美国南加利福尼亚州主题公园群落为研究对象，依据主题公园生态位模型，利用主成分分析法进行生态位测度。
The karst area in Guizhou Province was classified into five eco-economic categories by the principal component analysis and fuzzy poly-class method. 摘要运用主成分分析法和聚类分析法，对贵州喀斯特地区的生态经济类型进行了划分。
