[R] factor labels in model.frame

[Thomas Lumley]

On Mon, 8 Apr 2002, Dennis L. Malandro wrote:

> Hello,
>
> model.frame changes the factor labels when na.action =
> na.omit.
>
> > f <- gl(3, 2, 6, paste('m', 1:3, sep = ''))
> > r <- c(NA, NA, 3:6)
> > mf <- model.frame(~ r + f, na.action = na.omit)
> > mf
>   r  f
> 3 3 m1
> 4 4 m1
> 5 5 m2
> 6 6 m2
>
> But it seems like it should be this
> > mf
>   r  f
> 3 3 m2
> 4 4 m2
> 5 5 m3
> 6 6 m3
>
> intead.

It certainly should, and on my machine it is (both Linux and Win2k). I
don't see how you can get the first answer.

	-thomas



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