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Displaced Poisson distribution : ウィキペディア英語版
Displaced Poisson distribution
In statistics, the displaced Poisson, also known as the hyper-Poisson distribution, is a generalization of the Poisson distribution.
The probability mass function is
:
P(X=n) = \begin
e^\dfrac\cdot\dfrac, \quad n=0,1,2,\ldots &\text r\geq 0\\()
e^\dfrac\cdot\dfrac,\quad n=s,s+1,s+2,\ldots &\text
\end

where \lambda>0 and ''r'' is a new parameter; the Poisson distribution is recovered at ''r'' = 0. Here I\left(\cdot,\cdot\right) is the incomplete gamma function and ''s'' is the integral part of ''r''. The motivation given by Staff is that the ratio of successive probabilities in the Poisson distribution (that is P(X=n)/P(X=n-1)) is given by \lambda/n for n>0 and the displaced Poisson generalizes this ratio to \lambda/\left(n+r\right).
==References==



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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