ABSTRACT
The inverse Gaussian (IG) is a "long-tailed" positively skewed distribution, similar in shape to the lognormal distribution, that provides a useful alternative to other skewed distributions as a model in life-span and reaction-time studies. Although it was originally derived as the first passage of time distribution of Brownian motion with positive drift, it is perhaps better known today for its role as a model for highly skewed data. It is applicable in the physical, biological, and management sciences.
