[R] inconsistent behaviour of add1 and drop1 with a weighted linear model

[hadley wickham]

On 3/13/07, Peter Dalgaard <p.dalgaard at biostat.ku.dk> wrote:
> Jenny Hodgson wrote:
> > I was using Version 2.3.1 for Windows (binary download version). Guess I
> > should be using the latest version, (but the reason is I'm writing up my
> > PhD and I thought my results would be more 'repeatable' if I didn't keep
> > changing my version of the software, I didn't really think there would
> > be any glitches as big as this). Sorry if this is a waste of your time.
> > And thanks very much for replying so quickly.
> >
> > Jenny
> >
> >
>
> Always a good idea to check the NEWS file:
>
>     o   add1.lm() had been broken by other changes for weighted fits.

Yes, but a little impractical.  Has any one ever considered a standard
for the news file so changes could be extracted and included in online
documentation somewhere?

Hadley