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st: RE: retrieving a three-letter word from a string variable


From   "Dev Vencappa" <lexdvv@nottingham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: retrieving a three-letter word from a string variable
Date   Fri, 28 May 2004 16:11:07 +0100

Many thanks. This is working fine.

Dev

>>> n.j.cox@durham.ac.uk 05/28/04 04:04pm >>>
One way to do this is 

gen whatever = "HMV" if index(myvar, "HMV") 

If you're fond of -cond()- you might prefer

gen whatever = cond(index(myvar, "HMV"), "HMV", "") 

Neither is a retrieval solution, but the 
result is the same. 

Another way to do it is through retrieval: 

gen whatever = substr(myvar,index(myvar, "HMV"),3) 
	if index(myvar, "HMV") 

but I can't see any advantage to that. 

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

Dev Vencappa

>  I have a dataset that contains several string variables. 
> Suppose one string variable contains the following values in 
> one of the observations:
> 
> CMLST(HMV)
> 
> Another string variable contains :
> 
> COMSTL  GTRI(HMV)
> 
> I want stata to create a new variable that retrieves only the 
> three-letter word "HMV" from the string variable. I 
> understand that the substr command does that but because the 
> starting point of the word HMV is not the same for every 
> variable , it would be difficult to identify the correct 
> starting position to read the string and retrieve the first 
> three letters HMV. 
> Can somebody help please? I have tried the other string 
> commands but could not understand one that does what I want.

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