Dear Hanen,

You don't need "1" in your  R code. Try this:

# Model
mymodel<-lm(y~x1+x2)

# Coefficients
summary(mymodel)

See also ?lm.

Thanks,

Jorge



On Thu, May 29, 2008 at 5:15 PM, hanen <hanen.mastouri@yahoo.fr> wrote:

>
> hi,
>
>
> my linear model is y=c+a*x1+b*x2 i tried to found a, c, b by the use of:
>
> mymodel<-lm(y~1+x1+x2) where y, x1, x2 are 3 vectors with the same length
>
> the result is a=NA.so i want to know where is the problem.
> --
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