Shape parameter

In probability theory and statistics, a shape parameter is a special kind of numerical parameter of a parametric family of probability distributions.

Examples
The following continuous probability distributions have a shape parameter:
 * Beta distribution
 * Burr distributions
 * Erlang distribution
 * Exponential power distribution
 * Gamma distribution
 * Generalized extreme value distribution
 * Inverse-gamma distribution
 * Pareto distribution
 * Pearson distribution
 * Weibull distribution