Pennypacker(1980)、Madden(1981)等学者将韦布尔(Weibull)曲线y(x)=1-exp{-((x-a)/b)~c}(x>a,b>0,c>0)用以描述植病进展和植病导致产量损失的非线性回归关系,其生物学意义和适应性引起人们注意。但是如何利用一组实验数据来拟合该模型,一直没有一个简便易行的方法。为了解决这个问题,本文研究了Weibull模型的差分法拟合技术。 Pennypacker (1980), Madden (1981) and other scholars have Weibull curve y (x) = 1-exp {- ((xa) / b) ~ c} (x> a, b> 0, c> 0 ) Used to describe the non-linear regression relationship between the progress of plant diseases and the loss of yield caused by plant diseases. The biological significance and adaptability have attracted people’s attention. However, there is no easy way to use a set of experimental data to fit the model. In order to solve this problem, this paper studies the Weibull model’s difference method fitting technique.