堡子沟流域农业经济系统投影寻踪回归(PPR)分析

A PPR. Analysis on the Agricultural Economy System of Buzigou Watershed

采用投影寻踪回归（ＰｒｏｊｅｃｔｉｏｎＰｕｒｓｕｔＲｅｇｒｅｓｓｉｏｎ，简称ＰＰＲ）方法对黄土丘陵沟壑区第三副区，黄河中游第三期试点小流域——堡子沟流域农业总产值与农、林、牧、工副业产值进行分析，各业主次结果为种植、工副、林、牧，这与灰色分析的主次：牧、种植、工副、林相矛盾。进一步分析认为，ＰＰＲ分析的结果更合理。

Based on the method of Projection Pursuit Regression, this paper analysis the interrelationship of the total output value of Agriculture and the output value of forestry,stockraising and sideline of Buzigou watershed,the third turn experiment small watershed in the middle reaches of Yellow River in the third auxiliary region of the loess hill and gully area.The result shows the order of each industries in primary and secondary is plant,sideline,forestry and stockraising.This is contradicted with the result of the grey relational analysis.By further analysis,we think the result of PPR anslysis is more reasonable and reliable.