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st: friedman test


From   Maria Letizia Bacchi Reggiani <maria.bacchireggiani@unibo.it>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: friedman test
Date   Wed, 18 Jul 2012 14:41:26 +0000

I ‘ve some problems  performing Friedman test on STATA 11.
The STATA command help suggests to xpose, clear data and then to write friedman v?
In this way I obtain :

friedman v?
Friedman =  22.7333
Kendall =    0.8420
P-value =    0.0000

With  the form v1-v26 I obtain as result:

friedman v1-v26
Friedman =  59.5731
Kendall =    0.7638
P-value =    0.0000

Performing the same Friedman test with R and with Primer of Biostatistics I obtain a third result:
Friedman = 68.233
P-value =    0.0000

I’m a bit confused, could anybody help me?
Thanks
Letizia Bacchi

PS here you find the data

test1     test2     test3     test4
0             8             72           900
0             2             48           155
0             25           45           350
0             15           35           900
0             170         720         900
100         200         250         2000
0             0             0             750
0             36           150         2300
0             0             0             550
0             30           300         950
0             60           0             950
0             0             36           170
0             0             0             400
0             0             0             850
0             0             0             60
0             50           200         200
0             87           240         240
0             20           500         800
0             0             10           550
0             200         250         450
0             0             400         850
0             0             0             750
0             0             100         750
0             0             350         600
0             0             15           850
0             40           400         480




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