Hi,
I don't know how to make prediction with a factor in the linear model.
Say
yd=c(1,2,3,4,5)
> sl=c(2,3,4,5,6)
> sex=c("male","male","female","female","male")
> sex=factor(sex)
> m=lm(sl~yd+sex+sex:yd)
How to make a prediction with new data like yd=c(4,5,6,7,8) for male and
female separately ?
Thank you very much.
Zhao Jin
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