Hi Jo,
Next time try prepare a reproducible code.
You have several ways of do that (see Dylan Beaudette) and give a look
below.
x<-1:100
y<-7+x*(sqrt(x*runif(100)))
plot(y~x)
mod1<-glm(y~x)
mod2<-glm(y~x+I(x*x))
curve(mod1$coef[1]+mod1$coef[2]*x, col="red", add=T, lwd=3)
curve(mod2$coef[1]+mod2$coef[2]*x+mod2$coef[3]*x*x, col="green", add=T,
lwd=3)
cheers
milton
On Sun, Jun 7, 2009 at 11:36 PM, Jo Stringer <jstrin...@bses.org.au> wrote:
> Hi!
>
>
> I have fitted two glms assuming a poisson distribution which are:
>
> fit1 <- glm(Aids ~ Year, data=aids, family=poisson())
>
> fit2 <- glm(Aids ~ Year+I(Year^2), data=aids, family=poisson())
>
>
> I am trying to work out how to represent the fitted regression curves of
> fit1 and fit2 on the one graph. I have tried:
>
> graphics.off()
>
> plot(Aids ~ Year, data = aids)
>
>
> line(glm(Aids ~ Year, data=aids, family=poisson()))
> line(glm(Aids ~ Year+I(Year^2), data=aids, family=poisson()))
>
> but this does not work.
>
> Can anyone help me?
>
> Thanks
>
> Jo
>
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