st: dominance testing

[Shehzad Ali <sia500@york.ac.uk>]

Hi,

I am trying to test dominance of concentration curves using - dominance - 
command. Say there are 1,000 individuals in the sample and 300 of them have 
insurance and 700 don't. Concentration curves of their health care 
expenditures are plotted using - glcurve - command. Is it legitimate to 
test dominance of the two curves against each other or do we only test for 
dominance between two types of variables for the same individual?

When I run the dominance command I get an error saying 'no observations'. 
Here is what I am doing:

dominance y1 y2 [aw=wt], sortvar(x) rule(both)

where, 
y1= health expenditure of insured
y2=health expenditure of uninsured
x=income variable

Any help would be appreciated.

Cheers,

Shehzad
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