Probabilities.NegBinomCDFInv Function

Negative binomial distribution point percent function (PPF).

Pascal

function NegBinomCDFInv(y: double; R: double; p: double): double; overload;

Parameters	Description
y	Probability, real positive value on closed interval [0,1].
R	Defines number of successes, positive integer.
p	Defines probability of each trial, real value on closed interval [0,1].

Returns

the Negative binomial distribution point percent function (PPF) for probability y using the parameters R (number of success) and p (probability of success). Probabilities p and y must lie on the interval [0,1], and R must be greater or equal than one, otherwise the result is NAN.

Description

The result of NegBinomCDFinv is the smallest integer such that the negative binomial CDF evaluated at result equals or exceeds y. If the function returns NAN, either one of the inputs was NAN, or total loss of precision was detected.