These functions provide information about the Burr distribution with
location parameter equal to m, dispersion equal to
s, and family parameter equal to f: log hazard.
(See `rmutil` for the d/p/q/r boxcox functions density,
cumulative distribution, quantiles, and random generation).
The Burr distribution has density
$$
f(y) = \frac{\nu \sigma (y / \mu)^{\sigma-1}}
{\mu (1+(y/\mu)^\sigma)^{\nu+1}}$$
where \(\mu\) is the location parameter of the distribution,
\(\sigma\) is the dispersion, and \(\nu\) is the family
parameter.