If either 0 or n events occur in n observations, then the limits of the confidence interval can be calculated based on the confidence interval and the number of observations.
X =
= 1 - ((confidence interval in percent) / 100)
If 0 events occur in n observations
(1) lower limit for the confidence interval: 0
(2) upper limit for the confidence interval: 1 - ((X/2) ^ (1/n))
If n events occur in n observations
(1) lower limit for the confidence interval: ((X/2)) ^ (1/n))
(2) upper limit for the confidence interval: 1 (100%)
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