[R] analysing data with case weights: rejoinder

[Peter Dalgaard BSA]

Thomas Lumley <tlumley at u.washington.edu> writes:

> On Fri, 15 Nov 2002, bojaniss wrote:
> 
> > Hello,
> >
> > Based on replies (which I'm gratefull for) I guess the only solution
> > is to create a package, that will contain function to build
> > lm()-like linear models, and allow weighting cases (as I described
> > two days ago).
> >
> > This would also alow buliding those models for data in aggregated
> > form without a need for using e.g. expand$grid().
> >
> 
> There's no problem with data in aggregated form, only with probability
> weighting.

Depends on what you mean with "aggregation" doesn't it? If you have
"replication weights" (counts of data with given value), I think you
still have problems.

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