Returns the value of k for the given p-value and lambda. If p-val doesn't exactly map to a value of k, the k for which poissonCDF(k, lambda) is closest to pVal is used.
See Implementation
Returns the value of k for the given p-value and lambda. If p-val doesn't exactly map to a value of k, the k for which poissonCDF(k, lambda) is closest to pVal is used.