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RE: st: tabulate or other command?


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: tabulate or other command?
Date   Mon, 19 Nov 2007 14:28:11 -0000

This is an FAQ.

How do I compute the number of distinct observations? 
http://www.stata.com/support/faqs/data/distinct.html 

e.g. 

bysort postcode id: gen nvals = _n == 1
by postcode : replace nvals = sum(nvals) 
tabdisp postcode, cell(nvals) 

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

ncdcta00@uniroma2.it
--------------------
The idea is to calculate the total person for each code.
For ex
id postcode region
1   1        2
1   1        2
1   2        2
1   3        2
2   1        4
3   1        5


So I have 3 people in postcode1 1 in postcode 3 and 1 in postcode2.
if use tab the result is 4 obs with post code 1, but I have only 3
people, so because id is not unique.

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