Abstract
An application of multivariate analysis (principal component analysis, pattern analysis and cluster analysis) to water pollution research of Tamagawa river, and experimental data based on 36 samples of Tamagawa river in 1978, analyzed for eight elements, were used to demonstrate the ability of those method. The relationships among six elements to indicate water pollution were examined using principal component analysis and cluster analysis. The similarity between two water quality patterns was examined using pattern similarity.
