[Octave-bug-tracker] [bug #54557] [octave forge] (statistics) Unit tests in t_test.m fail randomly

[Rafael Laboissiere]

URL:
  <http://savannah.gnu.org/bugs/?54557>

                 Summary: [octave forge] (statistics) Unit tests in t_test.m
fail randomly
                 Project: GNU Octave
            Submitted by: rlaboiss
            Submitted on: Thu 23 Aug 2018 06:59:54 AM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: other
        Operating System: Any

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Details:

All unit tests in file install-conditionally/tests/t_test.m of the statistics
package (version 1.4.0) fail randomly.  Here is an example of how the bug can
be triggered:


octave:1> pkg load statistics
octave:2> while test("t_test", "verbose") ; endwhile
[...]
***** test
 x = rand (10,1); n = length (x);
 u0 = 0.5;
 pval = t_test (x, u0, "<");
 tval = tinv (pval, n-1);
 unew = tval * std(x)/sqrt(n) + u0;
 assert (mean (x), unew, 1000*eps);
!!!!! test failed
ASSERT errors for:  assert (mean (x),unew,1000 * eps)

  Location  |  Observed  |  Expected  |  Reason
     ()        0.49993      0.49993      Abs err 1.2859e-06 exceeds tol
2.2204e-13 by 1e-06


Increasing the tolerance seems to fix the problem. A trivial patch is attached
to this bug report.



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File Attachments:


-------------------------------------------------------
Date: Thu 23 Aug 2018 06:59:54 AM UTC  Name: t_test-increase-tol.patch  Size:
989B   By: rlaboiss

<http://savannah.gnu.org/bugs/download.php?file_id=44830>

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