Function p

pattern/metrics.py:688–689

(a, b, c, d)

    # Hypergeometric distribution.
    # (a+b)!(c+d)!(a+c)!(b+d)! / a!b!c!d!n! for n=a+b+c+d
    def p(a, b, c, d):
        return C(a + b, a) * C(c + d, c) / C(a + b + c + d, a + c)
    # Binomial coefficient.
    # n! / k!(n-k)! for 0 <= k <= n
    def C(n, k):