The following formula is involved in the calculation of confidence intervals for the mean of a Poisson distribution:
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Poisson mean confidence interval:

where n is the number of event occurrences in a given interval and χ2(p;k) is the Chi-square deviate with lower tail area p and degrees of freedom k.
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The following references can be used to cite this poisson confidence interval calculator:
 | Soper, D.S. (2013). Poisson Confidence Interval Calculator [Software]. Available from http://www.danielsoper.com/statcalc |
 | Garwood, F. (1936). Fiducial Limits for the Poisson Distribution. Biometrika, 28(3/4), pp. 437-442. |