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I think Antonio requested the number of matching strings in two string vars, so here is a modified version of Maarten`s code:
*************
sysuse auto, clear
clonevar make2=make
replace make="" in 2
replace make="" in 5
replace make="" in 22
replace make="" in 72
replace make2="" in 6
replace make2="" in 23
levels make
local levs "`r(levels)'"
levels make2
local levs2 "`r(levels)'"
/*same strings */
local levs3: list levs & levs2
di "number of strings " /*
*/ "in make and make2 = " /*
*/ `: word count `levs3''
*************
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected] [mailto:[email protected]] Im Auftrag von Maarten buis
Gesendet: Montag, 13. Juli 2009 17:39
An: [email protected]
Betreff: Re: st: count same strings among variables
--- On Mon, 13/7/09, Antonio Acconcia wrote:
> I have a number of variables, say x1-x10, with different
> number of observations all containing strings. I need to
> select those strings that (or simply to count how many
> strings) are present in x1-x2, x1-x3, and so on; how many
> are present in x2-x3, x2-x4, and so on ....but not in x1
> ..... The same string can appear at different lines (say
> observation 1 for x1 and observation 3 for x2).
levelsof x1
local levs "`r(levels)'"
levelsof x2
local levs "`levs' `r(levels)'"
local levs : list uniq levs
local k : word count `levs'
di "number of strings in x1 and x2 = " `k'
Hope this helps,
Maarten
-----------------------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
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