[Scipy-tickets] [SciPy] #1344: cdf of burr distribution is incorrect

SciPy Trac scipy-tickets@scipy....
Tue Dec 7 15:54:50 CST 2010


#1344: cdf of burr distribution is incorrect
-----------------------+----------------------------------------------------
 Reporter:  chairmanK  |       Owner:  somebody
     Type:  defect     |      Status:  new     
 Priority:  normal     |   Milestone:  0.9.0   
Component:  Other      |     Version:  0.8.0   
 Keywords:             |  
-----------------------+----------------------------------------------------
 In class burr_gen in stats.distributions, the _cdf method is incorrect.
 (Consider the cases x == 0.0 and x == numpy.inf)

 1614c1614
 <         return (1+x**(-c*1.0))**(-d**1.0)
 ---
 >         return 1.0 - (1+x**(-c*1.0))**(-d**1.0)

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Ticket URL: <http://projects.scipy.org/scipy/ticket/1344>
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