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st: RE: _merge

From   "Nick Cox" <>
To   <>
Subject   st: RE: _merge
Date   Tue, 26 Aug 2003 14:19:41 +0100

Dr. Frederick Wolfe
> A little more on this. xi: variables are automatically 
> dropped. If you want to keep them, then they need other 
> names. r() are discarded. 

I'm glad Fred and I seem to be converging rapidly here. 

On the principle that the exception proves the 
rule -- meaning strictly that the exception _tests_ 
the rule, as in the original Latin -- how far is the 
practice of -xi- consistent here? 

First, the documentation of -xi- clearly warns that 
its products get over-written. 

Second, -xi- variables contain information deducible 
from other variables. So long as those variables remain, 
they can be re-created willy-nilly. 

Hence this situation is pretty close to the opposite 
extreme, I think, and no precedent for -merge-. 

r-class results, again, are advertised as temporary 
results for the user's convenience, which can be 
re-created at will, so long as the data remain the 


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