What does the sigma value returned from Friedman's test represent?

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Diana Li
Diana Li 2016-10-30
编辑： Diana Li 2016-10-30
When I run the following for a Friedman's test:
M = [0.7876 0.7219 0.7743 0.7938
0.9045 0.7142 0.6346 0.7114
0.8912 0.8252 0.7809 0.7675
0.9031 0.7122 0.6132 0.6758
0.8296 0.7334 0.6563 0.6878];
[p tbl Fstats] = friedman(M)
I get:
p =
0.0293
tbl =
'Source' 'SS' 'df' 'MS' 'Chi-sq' 'Prob>Chi-sq'
'Columns' [15.0000] [ 3] [5.0000] [9.0000] [ 0.0293]
'Error' [10.0000] [12] [0.8333] [] []
'Total' [ 25] [19] [] [] []
Fstats =
source: 'friedman'
n: 5
meanranks: [3.8000 2.6000 1.4000 2.2000]
sigma: 1.2910
I understand where the values in tbl come from and what they represent, but I can't figure out what Fstats.sigma is supposed to be. Does anyone know?

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