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Old 08-12-2014, 03:42 PM   #25
chaoxing
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Location: US

Join Date: Aug 2014
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Pr(K=k)=(k+r-1,r-1)p^r(1-p)^k,
you set p=u/sigma^2, r=u^2/(sigma^2-u),

p and r are derived from here.

Thank you.
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