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 December 21st, 2016, 04:02 PM #1 Newbie   Joined: Dec 2016 From: UK Posts: 1 Thanks: 0 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.
 December 22nd, 2016, 06:22 PM #2 Global Moderator   Joined: May 2007 Posts: 6,216 Thanks: 493 It looks like A Poisson density (x integer) under the condition that x=0 is excluded.

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