[Scipy-tickets] [SciPy] #477: Poisson with lambda 0 fails

SciPy scipy-tickets@scipy....
Wed Aug 8 21:11:16 CDT 2007

#477: Poisson with lambda 0 fails
 Reporter:  danhs           |        Owner:  somebody
     Type:  defect          |       Status:  closed  
 Priority:  normal          |    Milestone:          
Component:  scipy.stats     |      Version:  0.5.2   
 Severity:  normal          |   Resolution:  invalid 
 Keywords:  stats, poisson  |  
Changes (by stefan):

  * status:  new => closed
  * resolution:  => invalid


 The Poisson CDF is only defined for lambda > 0.  From wikipedia:

 "λ is a positive real number, equal to the expected number of occurrences
 that occur during the given interval. For instance, if the events occur on
 average every 4 minutes, and you are interested in the number of events
 occurring in a 10 minute interval, you would use as model a Poisson
 distribution with λ = 10/4 = 2.5."

Ticket URL: <http://projects.scipy.org/scipy/scipy/ticket/477#comment:1>
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