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st: AW: Create a flag variable for 10 most frequent values


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: Create a flag variable for 10 most frequent values
Date   Mon, 16 Nov 2009 22:32:31 +0100

<> 



*************
clear*

//construct data
set obs 10000
gen dx=_n
//5000 unique values
sample 5000, count
 
//sort on dx
sort dx
//give the last 10 values a "1"
gen byte flag=_n>4990
//let`s see
l in -20/l
//tabulation of "flag"
ta flag
//properties of "dx" for flag "1" or "0"
table flag, c(freq mean dx min dx max dx)
*************



HTH
Martin

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Cohen, Elan
Gesendet: Montag, 16. November 2009 22:25
An: 'statalist@hsphsun2.harvard.edu'
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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