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(tài)位模型，利用主成分分析法進(jìn)行生態(tài)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(zhì)進(jìn)行綜合定量評價(jià)。
