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st: Poisson process to detect outliers


From   Katia Bobulova <katia.bobulova@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Poisson process to detect outliers
Date   Fri, 15 May 2009 17:55:42 +0100

Dear All,

anybody knows how to implement a Poisson process to detect outliers in Stata?

I tried to use this procedure (that I found in Stata FAQ) in order to
detect outliers:

sysuse auto, clear
sum mpg, detail
local u = r(p75) + (3/2) * (r(p75) - r(p25))
local l = r(p25) - (3/2) * (r(p75) - r(p25))
gen out = mpg<`l' | mpg>`u'
hist mpg          /*histogram including outlier*/
hist mpg if !out  /*histogram excluding outlier*

Is this the right procedure?

Thank you very much

Katia
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