st: Gamma coefficient in stata

[Dinesh Sharma <sharma@stat.fsu.edu>]

I am running a logistic regression with large data set (n=50000) and 
need to calculate the Kruskal's Gamma coefficient between the dependent 
variable y and the predicted probabilities. Is there any stata routines 
available for this? I tired tabulate command, which obviously did not 
work. Any suggestion is highly appreciated.

Thanks

Dinesh
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