This is documentation for an old release of SciPy (version 0.13.0). Read this page in the documentation of the latest stable release (version 1.15.1).
scipy.special.nbdtr¶
- scipy.special.nbdtr(x1, x2, x3[, out]) = <ufunc 'nbdtr'>¶
y=nbdtr(k,n,p) returns the sum of the terms 0 through k of the negative binomial distribution: sum((n+j-1)Cj p**n (1-p)**j,j=0..k). In a sequence of Bernoulli trials this is the probability that k or fewer failures precede the nth success.