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Re: st: quartiles


From   "Clive Nicholas" <Clive.Nicholas@newcastle.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: quartiles
Date   Sat, 8 May 2004 00:04:51 +0100 (BST)

Peter Harper wrote:

> Can tell me the commands to obtain a bottom and top quartile.

To which Thomas Trikalinos replied:

> tabstat variableName, stat(q)
> returns the p25, p50, p75 percentiles.

Another, and perhaps (slightly) simpler, solution is

. sum <var>, detail

which gives you all sorts of other sexy stuff about <var>. Thus:

. sysuse auto
(1978 Automobile Data)

. sum mpg, detail

                        Mileage (mpg)
-------------------------------------------------------------
      Percentiles      Smallest
 1%           12             12
 5%           14             12
10%           14             14       Obs                  74
25%           18             14       Sum of Wgt.          74

50%           20                      Mean            21.2973
                        Largest       Std. Dev.      5.785503
75%           25             34
90%           29             35       Variance       33.47205
95%           34             35       Skewness       .9487176
99%           41             41       Kurtosis       3.975005

CLIVE NICHOLAS        |t: 0(044)191 222 5969
Politics              |e: clive.nicholas@ncl.ac.uk
Newcastle University  |http://www.ncl.ac.uk/geps
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