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选取２３个与降水有关的因子和两个协变量，用逐步回归方法建立了估算自然降水雨强和降水时间的方程。用所建方程分析了人工增雨对雨强和降水时间的影响，并进一步对河南省１９８８～１９９６年飞机人工增雨的经济效益进行了评估。
Thirty-three precipitation-related factors and two covariates were selected and the equations for estimating rainfall intensity and precipitation time were established by stepwise regression. The built equation was used to analyze the effect of rainfall on rainfall intensity and rainfall time, and the economic benefits of aircraft artificial rainfall in Henan Province from 1988 to 1996 were also evaluated.