I have used R formulation style and I found this in some R documentations.

On Tue, Jan 26, 2010 at 4:12 AM, Walmes Zeviani
<walmeszeviani@hotmail.com>wrote:

>
> I supose you are following the SAS formulation style. R has a different
> formulation style, such as:
>
> da <- expand.grid(A=factor(1:3), x=1:10)
> da$y <- as.numeric(da$A)*da$x/(1.2+da$x)+rnorm(da$x, 0, 0.1)
>
> m0 <- nls(y~Asym[A]*x/(Time[A]+x), data=da, start=list(Asym=c(1,2,3),
> Time=c(1,1,1)))
> summary(m0)
>
> At your disposal.
> Walmes.
>
> -----
> ..oooO
>
> ..................................................................................................
> ..(....)... 0ooo...                              Walmes Zeviani
> ...\..(.....(.....)...     Master in Statistics and Agricultural
> Experimentation
> ....\_)..... )../....       walmeszeviani@hotmail.com, Lavras - MG, Brasil
> ............
>
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