st: Roctab and binomial exact confidence interval

[Garry Anderson <g.anderson@unimelb.edu.au>]

Dear Statalist,

webuse hanley
gen ratingm5 = rating
replace ratingm5 = rating - 5 if disease==0
roctab disease ratingm5,binomial


                      ROC                    -- Binomial Exact --
           Obs       Area     Std. Err.      [95% Conf. Interval]
         --------------------------------------------------------
           109     1.0000       0.0000        0.00023     0.05006


How does one interpret the 95% CI of 0.00023 to 0.05006 when the ROC
area is 1.00?

I have seen a dataset (n=47, 15 +ve) where the ROC area was 1.00 and I
wish to determine the lower 95%CI.

Cheers, Garry





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