[R] using gee

[Thomas Lumley]

On Sat, 7 Apr 2001, Jun Yan wrote:

> I have this trial function to use gee,
>
> trygee <- function (x, id) {
>   y <- x + rnorm(length(x))
>   dat <- data.frame(x=x, y=y, id=id)
>   foo <- gee(y ~ x, id, data=dat)
>   foo$coeffcients
> }
>
> > trygee(rnorm(100), id = 1:100)
> Error in model.frame.default(formula = y ~ x, id = id, data = dat) :
> 	Object "dat" not found
>
> Since I want to use gee within a function to be called again and again,
> what's the proper way to do this?  Thanks.


It's a bug. Near the top of the gee() function there is the line
    m<-eval(m,sys.parent())
This needs to be changed to
    m<-eval(m,sys.frame(sys.parent()))


	-thomas




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