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Re: st: RE: Count presence of item on different vars
Nick Cox wrote:
Well, now you tell us. Possibly some
variant on this:
quietly {
foreach v of var v6-v146 {
levelsof `v', local(this)
local all : list all | this
}
local all : list sort all
foreach text of local all {
local count = 0
foreach v of var var6-v146 {
count if `v' == "`text'"
local count = `count' + r(N)
}
noi di as txt "`text' `count'"
}
}
Nick
[email protected]
Nikolaos A. Patsopoulos
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?
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
r(134);
The unique values for each var is 4364 from a total of 25725
observations
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
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Nick I believe that you answered my problem, however I cannot test it
since " levelsof `v', local(this) " exceeds 800 items (if i get it right).
Nikos
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
