hndxaj 发表于 2010-10-8 15:21 
这个是最近碰到的问题,学了几天SAS发现逐步回归方法只对proc reg 有效啊 可是我想做的是二次多项式逐步回归 有高手能给点意见不?
You need to understand the general concept of linear regression.
For example,
y=a+bx+c*x^2 + error
y=exp(a+bx+c*x^2 + error)
and many more, are all sort of linear regression model.