[Scipy-tickets] [SciPy] #1289: Wrong / contradictory documentation of stats.mannwhitneyu

SciPy Trac scipy-tickets@scipy....
Mon Sep 27 10:10:19 CDT 2010


#1289: Wrong / contradictory documentation of stats.mannwhitneyu
-------------------------+--------------------------------------------------
 Reporter:  Wrzlprmft    |       Owner:  somebody
     Type:  defect       |      Status:  new     
 Priority:  low          |   Milestone:  0.9.0   
Component:  scipy.stats  |     Version:  0.6.0   
 Keywords:               |  
-------------------------+--------------------------------------------------
Changes (by josefpktd):

  * component:  Other => scipy.stats


Comment:

 "<20" was an incorrect statement that has been corrected in the online
 docs and recent versions of scipy.

 The p-value is based on the approximation by the normal distribution which
 is only correct in large samples. Why large samples start at 20 in this
 case, I don't know.

 It is a good idea to be more explicit in the docs that the minimum
 recommended sample size only applies to the p-values (also in other
 tests). The online documentation can be edited here
 http://docs.scipy.org/scipy/docs/scipy.stats.stats.mannwhitneyu/ (after
 getting editing permission)

 Do you have the distribution for small samples?

-- 
Ticket URL: <http://projects.scipy.org/scipy/ticket/1289#comment:1>
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