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st: data management - changing every 1st encountered of a str data content of a var


From   "b. water" <[email protected]>
To   <[email protected]>
Subject   st: data management - changing every 1st encountered of a str data content of a var
Date   Tue, 6 Jan 2009 07:52:03 +0000

dear all, 
 
stata 8.2 xp pro, 
 
i have a var like this: 
 
monopolar
bipolar
bipolar
bipolar
monopolar
nodiathrm
diathermy[2]
diathermy[2]
bipolar
monopolar
diathermy[2]
diathermy[2]
.
. <- denotes missing
.
monopolar
diathermy[2]
diathermy[2]
.
.
 
what i want to achieve is for every first encountered diathermy[2] to be changed to diathermy[1], while leaving the second occurence as diathermy[2]. is this possible in stata? if it can be done, would appreciate advice/help on how to achieve it. 
 
thank you,
bw
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