From p.dalgaard@biostat.ku.dk  Thu Aug 12 15:03:56 1999
From: p.dalgaard@biostat.ku.dk (Peter Dalgaard BSA)
Date: 12 Aug 1999 16:03:56 +0200
Subject: weighted.residuals() ?
In-Reply-To: Martin Maechler's message of "Thu, 12 Aug 1999 12:10:53 +0200"
References: <199908121010.MAA07648@sophie.ethz.ch>
Message-ID: <x2g11pjdtf.fsf@blueberry.kubism.ku.dk>

Martin Maechler <maechler@stat.math.ethz.ch> writes:

> I'm about to drop the above "[w!=0]", document weighted.residuals
> and fix  deviance.lm(.) according to John Maindonald's bug report
> (and use his suggestion to make cooks.distance() work for glm()'s ..).
> 
> Any objections ? [please in the next 5 hours or so...]

Be *very* careful! The zero-weight issue has bitten us several times
before. Check whether your change would be consistent with what lm/glm
does in such cases. (In particular, degrees of freedom calculations can
get in trouble).

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907
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weighted.residuals() ?
Peter Dalgaard BSA