If location
or scale
are omitted, they assume the default values of 0 and 1 respectively.
The Logistic distribution with location =
\(\mu\) and scale = s
has distribution function
$$ \frac{1}{1 + exp^{-\frac{(x-\mu)}{s}}} $$
and density
$$ \frac{exp^{-\frac{(x-\mu)}{s}}}{s(1+exp^{-\frac{(x-\mu)}{s}})^2} $$
It is a long-tailed distribution with mean \(\mu\) and variance \((\pi^2)/3 s^2\).