I think there is an error in the table. The "variance"-row shows only the second raw moment, and one should subtract the square of mean from it in order the get the actual variance, i.e., the second central moment.
The two parameter case supposedly states the coefficient of variation. However it doesn't make sense, as that expression can be greater than 1. (It also doesn't match when I enter EV and SD in a spreadsheet and just divide appropriately.) So the expression must be wrong. — Preceding unsigned comment added by 18.104.22.168 (talk) 21:27, 1 May 2014 (UTC)
First use of the term
When was the term hypoexponential first coined? The earliest reference I can find is this book
- Ruiz-Palá, Ernesto, Carlos Avila-Beloso, and William W. Hines. Waiting-line models: an introduction to their theory and application. Reinhold Publishing Corporation, 1967
where on page 11 the term is used
- "Distributions with variability greater or less than that of the exponential distribution are called hyperexponential and hypoexponential distributions, respectively."