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December 21st, 2016, 04:02 PM   #1
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Probability distribution

Hello, does any one recognise this formula?

https://www.wolframalpha.com/input/?...(-%5Calpha))*x!)

$\displaystyle \frac{e^{-\alpha}\alpha ^x}{(1-e^{-\alpha})x!}$


To what is refers?

King regards

Last edited by greg1313; December 21st, 2016 at 08:07 PM.
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December 22nd, 2016, 06:22 PM   #2
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It looks like A Poisson density (x integer) under the condition that x=0 is excluded.
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