In probability theory, the Generalized inverse Gaussian distribution (GIG) is a probability distribution with probability density function Probability theory is the mathematical study of probability. ... In mathematics, a probability distribution assigns to every interval of the real numbers a probability, so that the probability axioms are satisfied. ... In mathematics, a probability density function (pdf) serves to represent a probability distribution in terms of integrals. ...

It is used extensively in geostatistics, statistical linguistics, finance, etc. This distribution was popularised by Herbert Sichel, and thus is also known as the Sichel Distribution. Geostatistics applies the theories of stochastic processes and statistical inference to geographic phenomena. ... Dr Herbert Sichel (1915 to 1995) was a statistician who made great advances in the areas of both theoretical and applied statistics. ...