[R] adjusting a sigmoidal shaped regression

[Gabor Grothendieck]

Try this:

library(drc)
plot(y ~ x)
mod <- multdrc(y ~ x)
lines(x, fitted(mod))


On 4/29/07, Milton Cezar Ribeiro <milton_ruser at yahoo.com.br> wrote:
> Hi R-friends
>
> How can I adjust a sigmondal shaped regression in R?
> My data looks like
>
> x<-c(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16)
> y<-c(10,11,11,14,15,35,42,49,80,120,130,138,149,150,151,150)
> plot(y~x)
> modlin<-glm(y~x)
> yest<-predict(modlin)
> lines(yest~x)
>
> thanks a lot
>
> Miltinho
> Brazil
>
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