SciPy

scipy.special.nbdtri

scipy.special.nbdtri(k, n, y) = <ufunc 'nbdtri'>

Inverse of nbdtr vs p.

Returns the inverse with respect to the parameter p of y = nbdtr(k, n, p), the negative binomial cumulative distribution function.

Parameters:

k : array_like

The maximum number of allowed failures (nonnegative int).

n : array_like

The target number of successes (positive int).

y : array_like

The probability of k or fewer failures before n successes (float).

Returns:

p : ndarray

Probability of success in a single event (float) such that nbdtr(k, n, p) = y.

See also

nbdtr
Cumulative distribution function of the negative binomial.
nbdtrik
Inverse with respect to k of nbdtr(k, n, p).
nbdtrin
Inverse with respect to n of nbdtr(k, n, p).

Notes

Wrapper for the Cephes [R486] routine nbdtri.

References

[R486](1, 2) Cephes Mathematical Functions Library, http://www.netlib.org/cephes/index.html

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