ickePoissonisk
ickePoissonisk is a term used in statistics and related fields to describe phenomena whose counting statistics depart from Poisson behavior. The word blends icke, an inflected form of "not" in several Scandinavian languages, with Poissonisk, meaning "Poissonian." In usage, ickePoissonisk designates processes whose inter-arrival times are not exponentially distributed and whose variance does not equal the mean, in contrast to a Poisson process.
In formal terms, let N(t) be a counting process with mean μ(t)=E[N(t)] and variance σ^2(t)=Var[N(t)]. If σ^2(t)
Contexts where the term appears include quantum optics, biology, ecology, and telecommunications. In quantum optics, sub-Poissonian