A studied on the spatial pattern of Grapholitha funebrana populatin based on projection pursuit technology
YU Ming-fu1, ZHANG Yan-zhi2, LIU Jun-he1
1. Agriculture and Forestry Science Department of Huanghuai University, Henan, Zhumadian 463000, China; 2. Garden Management department of Zhumadian, Henan, Zhumadian 463000, China
Projction dimension reduction and optimaztion of dimentional data about the distribution of Grapholitha funebrana in U.S.A plum orchard were done based on projection pursuit(PP) technology.The result showed that spatial distribution of Grapholitha funebrana and directions and direction-levels were closely related on U.S apricot and plum.The larvae of Grapholitha funebrana aggregated on the centre and external of U.S plum,with much more larvae on the east and north.The density of Grapholitha funebrana forecasted in directions and direction-levels showed that the forecast and reality were in high optimization.The errors due to variables could be reduced by projection pursuit technology.Besides,the estimate could be much more accurate when there were more variables;and the tiny gap could show a very high weight value.
禹明甫1, 张艳枝2, 刘军和1*. 基于投影寻踪回归方法对李小食心虫种群空间格局的分析[J]. , 2008, 27(6): 474-477.
YU Ming-fu1, ZHANG Yan-zhi2, LIU Jun-he1. A studied on the spatial pattern of Grapholitha funebrana populatin based on projection pursuit technology. , 2008, 27(6): 474-477.