Distribution- Exponential

Gist

A distribution known for its use in waiting time (especially for its use in compartmental modeling).

Mathematics

A continuous form of the Distribution - Geometric

Properties

1. It is memoryless in that the
2. Generally, in compartmental modeling (like Model - SIR)- the waiting time of individuals is described with the exponential distribution.

How does it relate to other distributions?

1. The sum of $n$ exponential distributions is the equivalent of the Distribution - Gamma

Other notes

1. In 1958, it was considered not a useful distribution for application?