Thirdly, taking southern California theme parks cluster as a case, we calculate their niche by principle components analysis utilizing the model. 以美國南加利福尼亞州主題公園群落為研究對象，依據主題公園生態位模型，利用主成分分析法進行生態位測度。
The integrated quantitative evaluation on river water quality was made by principle components analysis and logarithm center method. 本文利用主成分分析和對數中心化的方法對江河水質進行綜合定量評價。
