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
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