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st: RE: RE: RE: filling in missing string


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: RE: filling in missing string
Date   Tue, 10 Jan 2006 16:32:56 -0000

In that case, the rules for filling in 
remain obscure. You must tell us what 
they are. 

Nick 
n.j.cox@durham.ac.uk 

Terra Curtis
 
Nick Cox
 
> If there is a one-to-one match between -product- and -molecule-, then 
> 
> bysort product (molecule) : replace molecule = molecule[_N] 
> if mi(molecule) 
> 
> may be what you want, as the non-missing strings get sorted 
> to the end of each block. 

Terra Curtis
  
> > I have a dataset which looks like:
> > 
> > 	Product	company	molecule
> > 	A		X		x1
> > 	A		Y		
> > 	A		Z		x1
> > 	.		.		.
> > 	.		.		.
> > 	.		.		.
> > 
> > I have several examples of this throughout a large dataset.  
> > I want to fill
> > in the missing "x1" under the molecule variable.  Is there 
> some way to 
> > do this using -by product- ?

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