IDAX.QPOIS - Inverse Poisson distribution

The QPOIS function returns the value x of a variable that follows the Poisson distribution for which the probability of being smaller or equal to x is equal to the specified percentage.

Syntax

IDAX.QPOIS(DOUBLE percentage, DOUBLE lambda)

Parameter descriptions

percentage: Mandatory.; The requested limit of the percentage.; If percentage is not in the range of 0 - 1, QPOIS(percentage,lambda) is null for all lambda values.; Min: 0.00000000001; Max: 0.99999999999; Data type: DOUBLE
lambda: Mandatory.; The mean number of successes within a specified time interval.; If lambda is 0 or less, PPOIS(x,lambda) is null for all x values.; Min: 0.00000000001; Data type: DOUBLE

If PPOIS(x,lambda)=perc, QPOIS(perc,lambda)=x for all positive x values and lambda values.

Returned information

INT8 the point x where PPOIS(x,lambda)=percentage.