[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
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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 |
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Changes (by stefan):
* status: new => closed
* resolution: => invalid
Comment:
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."
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Ticket URL: <http://projects.scipy.org/scipy/scipy/ticket/477#comment:1>
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