R help - May 2008 - lm() function

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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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.
> --
> View this message in context:
> http://www.nabble.com/lm%28%29-function-tp17546079p17546079.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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hanen 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.
>   
It's the sum of x1 and x2 equal to one?
run the command:  round( sum(  c(x1,x2) ),12)==1

cleber


		
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