Application of Discriminant Analysis and Decision Tree Analysis to the Classification of Ecological Hazards of Chemicals

Decision tree analysis,Mahalanobis distance discriminant analysis and Fisher discriminant analysis were employed to classify ecological hazards of 61 chemicals.Comparison between these methods showed 92%,87% and 75%,respectively in correctness of the classification.Decision tree was not only the highest in correctness,but also reduced 2 indexes in the evaluation.Moreover,analyses of the 61-index matrix demonstrated that the classification capacity of the decision tree method was very stable and its correctness displayed normal distribution,which remained around 92%.So it is the optimal method for the classification of ecological hazard in these methods.