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st: RE: "weighed centiles"


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: "weighed centiles"
Date   Wed, 28 Feb 2007 16:01:12 -0000

Consider 

. sysuse auto, clear 

. su mpg [w=weight], detail
(analytic weights assumed)

                        Mileage (mpg)
-------------------------------------------------------------
      Percentiles      Smallest
 1%           12             12
 5%           14             12
10%           14             14       Obs                  74
25%           16             14       Sum of Wgt.      223440

50%           19                      Mean           20.11153
                        Largest       Std. Dev.      5.400251
75%           23             34
90%           28             35       Variance       29.16271
95%           30             35       Skewness       1.121803
99%           35             41       Kurtosis       4.694955

. di r(p90) - r(p10)
14

That may be what you want.

Nick 
n.j.cox@durham.ac.uk 

Cinzia Rienzo

> i have to compute the gap centile  (90-10) for the variable 
> "res1st_zs" 
>  and weighed by the variable "hwt" for time series data. 
> But STATA does not allow me weighed centile, i also tried the 
> "dialog" 
> but i didn t get the results i wanted.

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