[Octave-bug-tracker] [bug #49961] [octave forge] (statistics) sign_test() returns incorrect p-value

[Nicholas Jankowski]

Follow-up Comment #6, bug #49961 (project octave):

seems both sign_test and signtest now reside only in the statistics package.

the behavior from comment #0 is still present in both functions using
statistics pkg v1.4.2.  checking against Matlab 2021a's signtest (it has no
sign_test), the output matches that of octave's signtest.

the comment #3 function in both programs does show discrepancy between Matlab
and Octave's signtest:

Matlab 2021a:

>> [pval, h] = signtest([-ones(1, 1000) 1], 0, 'tail', 'left')
pval =
  1.0917e-218
h =
  logical
   1


Octave 6.4.0, Statistics 1.4.2:

>> [pval, h] = signtest([-ones(1, 1000) 1], 0, 'tail', 'left')
pval = 1
h = 0


seems like Kai's suggestion from comment #4 still stands:  need to fix the
issues in signtest, then decide how to make any changes in sign_test, assuming
the plan is to keep sign_test and not just deprecate it (didn't see any
deprecate notes in NEWS)

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