[Scipy-tickets] [SciPy] #1647: BUG: stats: _argcheck function for the erlang distribution is misnamed.

SciPy Trac scipy-tickets@scipy....
Sun Apr 22 09:22:53 CDT 2012


#1647: BUG: stats: _argcheck function for the erlang distribution is misnamed.
------------------------------+---------------------------------------------
 Reporter:  warren.weckesser  |       Owner:  somebody    
     Type:  defect            |      Status:  needs_review
 Priority:  normal            |   Milestone:  Unscheduled 
Component:  scipy.stats       |     Version:  0.10.0      
 Keywords:                    |  
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Comment(by josefpktd):

 I think _arg_check could be deleted.

 I don't see a reason to impose that n is an integer. I checked a few
 examples.
 (many distributions are extended to real parameters instead of integers,
 for example degrees of freedom in t, using gamma function instead of
 factorial)

 According to
 http://en.wikipedia.org/wiki/Erlang_distribution#Related_distributions
 Erlang is just a reparameterized gamma distribution.

 Actually since we have scale generically, gamma and erlang are the same.

 wikipedia doesn't restrict the shape parameter in gamma to integers

 (it takes a while to submit without database locked)

-- 
Ticket URL: <http://projects.scipy.org/scipy/ticket/1647#comment:2>
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