[Scipy-tickets] [SciPy] #1340: stats for invgamma

SciPy Trac scipy-tickets@scipy....
Sat Dec 4 09:14:12 CST 2010


#1340: stats for invgamma
-------------------------+--------------------------------------------------
 Reporter:  josefpktd    |       Owner:  somebody
     Type:  defect       |      Status:  new     
 Priority:  normal       |   Milestone:  0.9.0   
Component:  scipy.stats  |     Version:  0.8.0   
 Keywords:               |  
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 invgamma does not contain _stats, and no information that the moments
 might only exist or be finite if alpha is large enough.

 From the wikipedia description
 http://en.wikipedia.org/wiki/Inverse-gamma_distribution
 it looks relatively easy to add explicit formulas for _stats().

 parameterization alpha is a, beta is scale

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Ticket URL: <http://projects.scipy.org/scipy/ticket/1340>
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