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st: -levels- available from SSC

From   "Nick Cox" <[email protected]>
To   <[email protected]>
Subject   st: -levels- available from SSC
Date   Tue, 16 Jul 2002 23:10:02 +0100

Thanks to Kit Baum, a -levels- program is now
available from SSC.

-levels- displays a sorted list of the distinct values of varname,
which should be a variable taking on integer or string values, or in
other words, a categorical variable, very broadly so defined.

It may be useful when it is desired to cycle through the
distinct values of varname with (say) -foreach-. -levels-
leaves behind a list in r(levels) which may be used in a
subsequent command. Optionally, the list may be inserted
as a local macro within the calling program's space.
-levels- is considered to be -vallist- (STB-60, same author) done

Stata 7 is required.

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