These functions provide information about the Levy distribution
with location parameter equal to m and dispersion equal to
s: density, cumulative distribution, quantiles, and
random generation.
The Levy distribution has density
$$
f(y) = \sqrt{\frac{\sigma}{2 \pi (y-\mu)^3}} \exp(-\sigma/(2 (y-\mu)))$$
where \(\mu\) is the location parameter of the distribution and
\(\sigma\) is the dispersion, and \(y>\mu\).