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st: RE: about the return list of -codebook-


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: about the return list of -codebook-
Date   Thu, 30 Aug 2007 23:11:15 +0100

If it did this, it would be (a) documented
and (b) evident from -return list- after 
applying the command. 

-codebook- is an r-class command, but the r-class
results issued are restricted to problem reports. 

More positively, when you say "unique" values 
I take it that you mean "distinct". Either way, 

. search unique, faq 

points to various ways of finding this out, 
including dedicated programs. One that sticks
in my mind somehow is -distinct- from SSC by
Gary Longton and another. Also you could
do something like 

. levelsof mpg, local(levels)

. di `: word count `levels'' 

Nick 
n.j.cox@durham.ac.uk 

Luhang Wang
 
> Does anyone know whether Stata stores the number of unique values
> after command -codebook- in any built in macro, just like r(mean) for
> mean after -sum-? 

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