Contradictory results from u_test und sign_test

[Alexander Klein]

Hi,

a while ago I noticed that u_test and sign_test produce quite contradictory 
results:

octave-3.2.3:1> X=[1 2 3]
X =

  1   2   3

octave-3.2.3:2> Y=[4 5 6]
Y =

  4   5   6

octave-3.2.3:3> sign_test (X,Y,"<")
warning: binomial_cdf is obsolete and will be removed from a future version of 
Octave; please use binocdf instead
 pval: 0.125
ans =  0.12500
octave-3.2.3:4> u_test (X,Y,"<")
 pval: 0.975233
ans =  0.97523

I contacted the original author, Kurt Hornik, but since he wrote the functions 
quite some time ago he couldn't remember the details, yet agreed that at least 
one result is questionable.

Kind regards,

        Alex

-- 
Alexander Klein, Dipl.-Math.                    Fon: 0641/99-32194
Lehrstuhl für Numerische Mathematik             Fax: 0641/99-32199
Heinrich-Buff-Ring 44
35392 Giessen