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

[hadley wickham]

On 3/13/07, Duncan Murdoch <murdoch at stats.uwo.ca> wrote:
> On 3/13/2007 3:14 PM, hadley wickham wrote:
> > 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?
>
> It's in a structured format, and is online.  The readNEWS() function can
> read it.  It would be nice if someone would contribute a more friendly
> reader...
>
> Try
>
> readNEWS(url("http://cran.r-project.org/bin/windows/base/NEWS.R-2.5.0dev"),
> chop="keepAll")[[c("2.5","2.5.0","BUG FIXES")]]
>
> for the unfriendly but informative version.

Oh, that's neat.  One thing that would be very useful would be to
figure out what (if any) functions an news item refers to.  A grep
against all function names in base packages wouldn't be too hard to
do.

I'll think about it, and how to render it nicely in a webpage.

Hadley