'skewness'

@property
def skew(self):

    (n, a, b) = (self.n, self.a, self.b)
    t1 = ((((a + b) + (2 * n)) * (b - a)) / ((a + b) + 2))
    t2 = sqrt((((1 + a) + b) / (((n * a) * b) * ((n + a) + b))))
    return (t1 * t2)
