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st: Proper usage of Macros stored in summarize


From   Thomas Speidel <thomas@tmbx.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Proper usage of Macros stored in summarize
Date   Tue, 02 Dec 2008 11:18:43 -0700

I am trying to use macros stored in the summarize command to flag outliers/influenetial observations if they fall outside of this range:
p25 - 2IQR <= var  <= p75 +2IQR

suppose I try to do this on the weight var from the auto.dta dataset (with a little modification):

sysuse auto, clear
set obs 75
replace weight = 8000 in 75
qui: summ  weight, d
gen weight_outlier=1 if (weight>`p(75)'+2*(`r(p75)'-`r(p25)') & (weight<.))
replace weight_outlier=1 if (weight<`p(25)'-2*(`r(p75)'-`r(p25)'))

If I was to do it by hand:
. di 3*2240-2*3670
-620
. di 3*3670-2*2240
6530
gen weight_outlier2=1 if weight>6530 & weight <.

There is something I am doing wrong in the first approach - read: poor macro programming :-) - but can't quite grasp what the problem is.
Thanks

--
Thomas Speidel--
Thomas Speidel

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