The variability of individuals in a population (frequency distribution);
The value of a random variable (probability distribution); and
The uncertainty we have about a fixed, but imprecisely known, parameter in nature (uncertainty distribution).
This section is a resource to allow you to look up specific distributions by name, to see how they are used, learn how to generate their values when they are not directly available in your preferred software, and review the most useful equations associated with each distribution. We have also described the inter-relationships between various distributions and provided links to related topics.