cdf
Returns the cumulative distribution function value at k for this beta-binomial distribution.
Gives the probability of observing k or fewer successes. Computed by summing PMF values from 0 to k using the log-sum-exp technique for numerical stability, then exponentiating the result.
Return
the probability of k or fewer successes, in the range [0, 1].
Parameters
k
the number of successes at which to evaluate the cumulative probability.