From bolker@zoo.ufl.edu  Wed Nov  1 15:05:19 2000
From: bolker@zoo.ufl.edu (bolker@zoo.ufl.edu)
Date: Wed, 1 Nov 2000 10:05:19 -0500 (EST)
Subject: [Rd] Re: desiderata for data manipulation
In-Reply-To: <x2u29rhifs.fsf@blueberry.kubism.ku.dk>
Message-ID: <Pine.LNX.4.10.10011011002570.12003-100000@bolker.zoo.ufl.edu>


  What does Stata do in this case?
  I suppose you could generate an error, or give the user the choice to
duplicate Y1/assume Y1 was the first or last case and put in NAs for the
others.

On 1 Nov 2000, Peter Dalgaard BSA wrote:

> (The problem would be that in principle you'd know what to do with
> 
> A B Y             
> 1 1 0.1           A Y1 Y2
> 1 2 0.3    ---->  1 0.1 0.3
> 2 1 0.7           2 0.7 0.9
> 2 2 0.9
> 
> but suppose there's a fifth line as in
> 
> A B Y  
> 1 1 0.1
> 1 2 0.3
> 2 1 0.7
> 2 2 0.9
> 2 2 1.1
> 
> Then you'd have two candidates for the value of Y2 for A==2 and it
> wouldn't help to assume that there are really two cases with A==2,
> because you can't really be sure about to which case the Y1 should
> belong.)
> 

-- 
318 Carr Hall                                bolker@zoo.ufl.edu
Zoology Department, University of Florida    http://www.zoo.ufl.edu/bolker
Box 118525                                   (ph)  352-392-5697
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[Rd] Re: desiderata for data manipulation
bolker@zoo.ufl.edu