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incomplete gamma function |
gamma |
The incomplete gamma function Γ(a,x)
is a variation on the gamma function.
An alternative incomplete gamma function can be defined as the integral from 0 to x. It may be clear that this is the same function, apart from a constant.
The function can be normalized to the regularized incomplete gamma function Q(a,x) defined by: Γ(a,x) / Γ(a).
The incomplete gamma function and its inverse are
used in statistics.