How to estimate concordance index by harding and pagan (2002)

[Long Cletus]

Hi,
please help, i want to estimate the concordance index between two circles based on Harding and Pagan (2002) procedure in Stata and i do not know the code to use

regards
Long

[Richa jain]

Hey!
I am doing a similar thing. Could you able to figure out the code for estimating concordance index? Please help