HI,

Perhaps:
zscore<-function(x, y, data) {
lm<-lm( y ~ x , ...)
z <- coef(lm)/sqrt(diag(vcov(lm)))
return(z)
}



On 23/10/2007, Peter Tait <[EMAIL PROTECTED]> wrote:
>
> Hi,
>
> I am writing a basic function to extract the z scores for some linear
> regression coefficients:
>
> zscore<-function( y, x) {
> lm<-lm( y ~ x )
> z <- coef(lm)/sqrt(diag(vcov(lm)))
> return(z)
> }
>
> I would like to pass a dataframe to the function as a argument so the
> function call changes from
>
> zscore(df$y1,df$x1)
>
> to
>
> zscore(y1,x1,data=df)
>
> but I am not sure how to reference the data frame inside the function.
>
> Are there any good free references on how to program functions in R
> (besides
> the official manuals)
>
> Thanks for your help.
> Cheers
> Peter
>
> ______________________________________________
> 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.
>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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