CumPoissonInv

new in Analytica 4.7

CumPoissonInv( p, mean )

The inverse of the CumPoisson function. Returns the smallest number of events, k, such that the probability P( n ≤ k ) is at least «p» when n has a Poisson distribution with a mean of «mean». «p» must be a value between 0 and 1, and «mean» must be positive. Since the Poisson distribution is a distribution on the integers, the result is an integer value.

This is an analytic function, so that the result is not subject to sampling error.

Examples

CumPoissonInv( 0.8, 10 ) → 13

See Also

• CumPoisson
• Poisson