st: population attributable risk - confidence intervals

[Victor Mauricio Herrera <vherrera@wisc.edu>]

Dear all, 
I wonder if there is a routine to calculate population attributable risks and their corresponding 95% confidence intervals using Levine's formula: PAR=[Pe*(RR-1)]/[1+ Pe*(RR-1)].
Pe: prevelance of exposure in the population; RR: relative risk.

Thanks,

Mauricio Herrera.
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