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RE: st: RE: Problems with -ipolate-

From   "Nick Cox" <>
To   <>
Subject   RE: st: RE: Problems with -ipolate-
Date   Tue, 6 Sep 2005 17:51:46 +0100

I sense a tendency here to see interpolation 
as just a particular case of imputing missing 
values, but I think that can be misleading. 
The particularities of interpolation are more important 
than the similarities to other kinds of imputation. 

Interpolation historically within mathematics 
and science -- and the history covers many 
centuries -- covers single-valued responses 
for a grid of values of time or some other controlling 
variable(s). For some of that grid, we may lack response values
and therefore might wish to interpolate. This 
will only work well with small gaps and smooth 

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