Using the method of principal component Analysis based on the sample data of 65 individuals with normal pulmonary function, we obtained the first and second principal components.

根据65例正常肺功能的样本数据，应用主成份分析方法，我们算得第一、第二主成份。

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Then utilizing principal component analysis, the author analyzed the data of each period and concluded that the first and second principal component's accumulative proportion is more than 85 percent.

根据第一主成分和第二主成分的特征向量计算各时间段的第一主成分和第二主成分的指标值。

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The first principal component can denote the degree of soil salinity, and the second and third principal component can denote the degree of soil alkalinity.

第一主成分综合反映了区内土壤盐渍化程度，第二和第三主成分联合反映了土壤的碱性特征。

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