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st: levels for varlist?

From   "Danielle H. Ferry" <>
To   StataList <>
Subject   st: levels for varlist?
Date   Tue, 23 Sep 2003 10:43:24 -0400


Is there a command similar to -levels- that works across a varlist?
Specifically, suppose I have the variables highrisk1, highrisk2, lowrisk1,
lowrisk2, lowrisk3. I want to write a program with a loop that does
something when highrisk==1, then when highrisk2==1, then when lowrisk1==1,
then when lowrisk2==1, and finally when lowrisk3==1. For example:

program define example

    forval i = 1(1)2 {
     ta year if `1'`i'==1


example highrisk
example lowrisk

Since there are 2 highrisk variables and 3 lowrisk variables, the way I've
written it, this will miss tabulating when lowrisk3==1. If I make the second
line: "forval i = 1(1)3 {" then Stata will object when it gets to
"highrisk3==1" since highrisk3 doesn't exist. Something similar to -levels-
would enable Stata to figure out what the max on `i' should be.


Danielle H. Ferry
National Bureau of Economic Research
365 Fifth Avenue, 5th Floor
New York, NY 10016
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