PSPP-BUG: [bug #26936] T-TEST reports 2*p instead of p

[Ben Pfaff]

URL:
  <http://savannah.gnu.org/bugs/?26936>

                 Summary: T-TEST reports 2*p instead of p
                 Project: PSPP
            Submitted by: blp
            Submitted on: Wed Jul  1 15:35:30 2009
                Category: Numerical Errors
                Severity: 5 - Average
                  Status: None
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: None
                  Effort: 0.00

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Details:

Mike Griffiths <address@hidden> reports, at
http://lists.gnu.org/archive/html/bug-gnu-pspp/2009-06/msg00026.html:

> 3.  I entered the following (admittedly nonesense) data and called up a
> paired-samples t-test.  PSPP gave the correct value of t (1.00) but for
the
> p-value gave 1.577, which is bigger not only than the correct figure but
than
> the maximum theoretically possible p-value (which is 1).  (A little
> experimenting with other paired-samples tests suggests that the programme
is
> reporting 2-p, where p is the correct value.)
>  
> a    b
> 11  2
> 1   1
> 1   1





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