[R] pairwise.t.test: empty p-table

From: Thomas Hoffmann <thomas.hoffmann_at_uni-bonn.de>
Date: Wed 03 May 2006 - 06:03:12 EST


Hi list-members

can anybody tell me why

> pairwise.t.test(val, fac)

produces an empty p-table. As shown below:

        Pairwise comparisons using t tests with pooled SD

data: val and fac

       AS AT Fhh Fm Fmk Fmu GBS Gf HFS Hn jAL Kol R_Fill
AT     -  -  -   -  -   -   -   -  -   -  -   -   -    
Fhh    -  -  -   -  -   -   -   -  -   -  -   -   -    
Fm     -  -  -   -  -   -   -   -  -   -  -   -   -    
Fmk    -  -  -   -  -   -   -   -  -   -  -   -   -    
Fmu    -  -  -   -  -   -   -   -  -   -  -   -   -    
GBS    -  -  -   -  -   -   -   -  -   -  -   -   -    
Gf     -  -  -   -  -   -   -   -  -   -  -   -   -    
HFS    -  -  -   -  -   -   -   -  -   -  -   -   -    
Hn     -  -  -   -  -   -   -   -  -   -  -   -   -    
jAL    -  -  -   -  -   -   -   -  -   -  -   -   -    
Kol    -  -  -   -  -   -   -   -  -   -  -   -   -    
R_Fill -  -  -   -  -   -   -   -  -   -  -   -   -    
Sa     -  -  -   -  -   -   -   -  -   -  -   -   -    


However val and fac do have the same length and are not empty:
> summary(fac)

    AS     AT    Fhh     Fm    Fmk    Fmu    GBS     Gf    HFS     Hn    
jAL    Kol R_Fill     Sa
    50     14      7     35     14     25     59     51     90     
65     12     26     96     26

> summary(val)
Min. 1st Qu. Median Mean 3rd Qu. Max. NA's
  0.0000 0.1744 0.6395 2.1540 1.7440 40.1200 223.0000

Thanks in advamce
Thomas H.



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