# 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 [1] routine `nbdtri`.

  References

  1

    Cephes Mathematical Functions Library, http://www.netlib.org/cephes/

scipy.special.nbdtrc scipy.special.nbdtrik