Projection pursuit model for rank evaluating drought based on logistic curve

Abstract

Existing drought evaluation method which people easy to appear the interference of artificial weights, this paper puts forward projection pursuit model for evaluating drought based on logistic curve and selects the drought evaluation index as projection parameters to seek its best projection direction. Taking Qiqihar area as research objects, the departure ratio of rain-fall, dry index and Z index were selected to establish drought assessment model based on above methods. The results showed that the model could avoid the interference of artificial weights. This method is feasible to evaluate the drought.