sf
Computes the survival function (SF) at the given point.
The survival function returns the probability that a random variable drawn from this distribution takes a value strictly greater than x. It is the complement of the CDF, that is, sf(x) = 1 - cdf(x). Some distributions override this default to provide a numerically more accurate result in the upper tail.
Return
the probability that a value is greater than x, in the range [0, 1].
Parameters
x
the point at which to evaluate the survival probability.