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st: dominance test for concentration curve


From   "Vincenzo Carrieri" <vincenzo.carrieri@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: dominance test for concentration curve
Date   Thu, 14 Aug 2008 22:01:52 +0200

Dear statalister,
I drew on stata a concentration curve for hospitalization days with
regard to people ranked by socio-economic conditions. Now, I would
like to perform dominance test for my Concentration Curve against 45
line by using dominance.ado file.
My stata command was: dominance nnotti rank, sortvar (socio-economic)
rule (both)

where:
nnotti is my y-axis variable for hospitalization days
rank is to draw perfect equality curve
socio-economic is my categorical variable (5 groups)


But Stata give me the following error message:
standard error evaluated to missing
already preserved r(621);

Is it maybe because I cannot test for dominance with concentration
curve with categorical
variable on x-axis or there is something wrong in my command?

Could someone help me?
Many thanks,

Vincenzo
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