plot lines through regression model

[Brendaa]

Hi guys,

This is probably a very simple question but I can't figure it out myself...

I have made a regression model and I found a way to plot this model but I can't figure out how to draw lines through these points that are based on the model I made.

the Regression model looks like this:
model<-glm(y~NDVI*Variety, binomial) (Variety is a factor with 3 levels).

I plotted the points with this code:
pAnimal<-split(Animal, Variety)
pNDVI<-split(NDVI, Variety)
plot(NDVI, Animal, type="n", ylab="proportion animal")
points(pNDVI[[1]], pAnimal[[1]], pch=16)
points(pNDVI[[2]], pAnimal[[2]], pch=16)
points(pNDVI[[3]], pAnimal[[3]], pch=16)

So I want lines that are based on the regression model drawn through the points I plotted.

Can anyone help me out?

Cheers,
Brenda

[stephenb]

fit<- fitted (model)

and then plot them with points() or lines()

I am not sure what are you plotting though as y is not plotted at all from what I see.
I think you should be plotting y vs your regressors.