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Re: st: working with percentile cutpoints


From   "Svend Juul" <[email protected]>
To   <[email protected]>
Subject   Re: st: working with percentile cutpoints
Date   Tue, 22 May 2007 17:37:10 +0200

Paul Visintainer wrote:
 
Is there a way to create a new variable that uses cutpoints based on
unique percentiles of distribution?  For example, suppose I want a new
variable with 4 groups at (or as close as the distribution will allow)
the following percentile cutpoints:  13th percentile, 35th percentile,
and the 73rd percentile?  I've looked at -xtile-, -pctile-, and -egen-
and they don't seem to allow for this option.
 
--------------------------------------------------------------------
 
The -egenmore- -xtile()- function does it. You may need first to
    ssc install egenmore
 
. sysuse auto , clear
. egen pricegrp = xtile(price) , percentiles(13 35 73)
. tab1 pricegrp
 
-> tabulation of pricegrp  
 
   pricegrp |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         10       13.51       13.51
          2 |         16       21.62       35.14
          3 |         29       39.19       74.32
          4 |         19       25.68      100.00
------------+-----------------------------------
      Total |         74      100.00

Hope this helps
Svend
________________________________________________________ 
 
Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6 
DK-8000 Aarhus C,  Denmark 
Phone, work:  +45 8942 6090 
Phone, home:  +45 8693 7796 
Fax:          +45 8613 1580 
E-mail:       [email protected] 
_________________________________________________________ 

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