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st: percentiles


From   "Don Spady" <dspady@ualberta.ca>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: percentiles
Date   Fri, 11 Oct 2002 09:46:19 -0600

Dear all
  I am trying to use the command "pctile" to get percentiles of the values
in a variable.  The values are individual ages.
I have used the commands:
pctile  pct=age
pctile pct=age, genp(pctAge)
but when I run it and then list the first 10 instances I get

. list pct age in 1/10

           pct       age
  1.         9        14
  2.         .        17
  3.         .         1
  4.         .        14
  5.         .         5
  6.         .        12
  7.         .        14
  8.         .         7
  9.         .         9
 10.         .         0

The ages run from 0 to 17 and are fairly evenly distributed.
?? Why don't I get any values in the pct column and what does the '9' mean.
Many thanks for any help.


Donald Spady
Dep't of Pediatrics, University of Alberta
(780) 407-1244

Nature has no reset button.


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