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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