[Octave-bug-tracker] [bug #48472] statistics: incorrect results from anovan

[Muhali]

URL:
  <http://savannah.gnu.org/bugs/?48472>

                 Summary: statistics: incorrect results from anovan
                 Project: GNU Octave
            Submitted by: muhali
            Submitted on: Mon 11 Jul 2016 11:17:00 AM PDT
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.2
        Operating System: GNU/Linux

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Details:

A simple test case like


pkg load statistics

y = randn(100,1) ;
g1 = unidrnd(3, 100, 1) ;
g2 = unidrnd(2, 100, 1) ;
p = anovan(y,[g1,g2])


produces obvious nonsense:

warning: division by zero
warning: called from
    anovan at line 139 column 8
warning: division by zero
warning: division by zero
p =

   NaN
   NaN





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