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st: -return list- after -codebook-

From   "Luhang Wang" <>
Subject   st: -return list- after -codebook-
Date   Thu, 10 Apr 2008 16:03:49 -0400

Dear all,

Does anyone know why I get nothing with -return list- after
-codebook-? I did check the ado file of -codebook- and it is an rclass
command. It also seems a series of r() are well defined in the

My purpose is to get the number of unique values of a variable stored
in a scalar or macro. Any suggestion of achieving this, maybe in other
ways, will be appreciated. Thanks a lot.

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