like1 发表于 2010-5-30 17:02
请教:如何用SAS实现Logistic 、Gompertz、Richards、Mitscherlich 和Korf模型的拟合?
The methodology of nonlinear regression is no much different from linear regression. It minimizes a objective function(usually e^2). For example, logistic regression can be thought as NONLINEAR regression with a iterative re-weight.