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Re: st: RE: Count presence of item on different vars

From   "Nikolaos A. Patsopoulos" <>
Subject   Re: st: RE: Count presence of item on different vars
Date   Mon, 09 Oct 2006 18:27:01 +0300

Nick Cox wrote:
Check out -tabm- from -tab_chi- on SSC.
Alternatively, an approach from first
principles is to -reshape long- so that this reduces to a two-way tabulation.
Nikolaos A. Patsopoulos

I've got a set of variables v6-v146, each one containing string values (unique values ~4500):

v6 v7 v8 v9 v10...
text1 text1 text3 text45 text1...
text5 text2 text1 text455 text1

I want to count how many times each of the values appears in at least one of the v6-v146 in each row [observation], e.g. text1 appears at least once in 7365obs.

How can achieve this?
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I tried :
tabm v7-v146

I had to kill the process after few minutes (it's a 150MB database)

Then used:

tabm v7-v8  // just to see what will come up but that's what I got:
too many values

The unique values for each var is 4364 from a total of 25725 observations


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