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st: STATA loop terminating over missing variables

From   Akshay SHanker <>
Subject   st: STATA loop terminating over missing variables
Date   Mon, 01 Dec 2008 17:08:57 +1100


I am running the following simple loop which i need some help with:

forvalues i =1/15
forvalues j=1/15{
gen mindiff`i'_`j' = mindiff``i' - mindiff`j' 

The problem is that not all combinations of i and j exist , so for example mindiff1_2 may not exist. Everytime the loop goes over such a variable, the loop terminates and thus stops running the loop over all consecutive variables which may exist. How do i stop the loop from terminating? 

Thank you in advance for any help. 

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