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st: RE: filling in missing string


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: filling in missing string
Date   Fri, 6 Jan 2006 21:35:35 -0000

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. 

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

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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