Using the regression statistic method to analyses the relation between ASPT and chemical index

Abstract

Data for ASPT, DO, BOD₅ and COD values were obtained for fourteen stations during the years 1998, 1999, 2000 and 2001. Samples were taken in March, June, September and December from four catchments: Tamdao stream, Vucthuyen river, Cauton river and Calo river. The Tools-Data Analysis-Regression computer program of Microsoft Excel was used to analyse the relation between ASPT and chemical index. The multiple-regression analysis indicated that ASPT was closely related to chemical index. These relationships were significant with P value lower than 0.05, and this analysis also indicated that ASPT was best closely related to DO (dissolved oxygen) and COD.