Seroprevalence presents a strong spatial correlation in lake region with certain yearly variability, but such spatial correlation is weak in mountainous region.
湖区人群血吸虫血清学阳性率存在很强的空间相关性且每年略有差异，而山区的空间相关性不强。
The monthly and yearly evolution of water quality were studied by means of PCA, and its response to environment acidification is analyzed by means of correlation.
采用主成分分析的方法，探讨了不同统计口径水质演化的年际和月变化特征。
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