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st: a question about local macro

From   "Jian Zhang" <>
Subject   st: a question about local macro
Date   Fri, 11 Nov 2005 08:47:37 -0800 (PST)


I have a question about the local macro.  I could not figure out why and 
how to get around it.  Hope that you can help me out. 

Here is the question.  In my do file, I have two commands as follows:

local IC="IC412 IC413"
reg y `IC'

The question is that when I run the two commands together
it works.  But I found that if I then re-run the second command without 
running the first command,  I thought it should give the same results 
since i have already defined the local macro, so I do not need to 
redefine it.  It turns out that this time stata treated `IC' as empty. 
That means if I want to run the second command,  i always need to run the 
two commands together.  Am I correct?  Any explanations? Is there anyway 
to get around this?


Jian Zhang   

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