<>
Here is a strategy:
*************
clear*
//construct data
set obs 10000
gen dx=1+int(100*runiform())
//see freqs
ta dx
//use ben jann`s -fre-
capture which fre
if _rc ssc install fre
fre dx, desc
//get counts next to "dx"s
bys dx: egen mycount=count(dx)
//collapse to one per group
bys dx: keep if _n==1
//-sort- on count var
sort mycount
//take the last ten
gen byte mostfreq=inrange(_n,`=_N-9',_N)
//and back as we were
expand mycount
//see result
ta myc mostfreq
*************
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Cohen, Elan
Gesendet: Montag, 16. November 2009 22:25
An: '[email protected]'
Betreff: st: Create a flag variable for 10 most frequent values
Hi all,
I have a string variable dx that represents a patient's diagnosis (about
5,000 unique values). I'd like to create a "top 10 flag" that equals 1 if
dx is one of the top 10 most frequent diagnoses and 0 otherwise.
I'm not even sure where to begin. If someone could point me in the right
direction, I'd be grateful. Stata 10, Windows XP
Thank you,
- Elan
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