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2x2x4
2012 Sep 18
1
Cochran-Mantel-Haenszel test
...t 500 1981.2 79.2480000
I wanted to test whether significant differences existed between depth
in summer vs. winter, and day vs. night, controlling first for season
and then for time of day. I carried out a Cochran-Mantel-Haenszel test,
using Average Frequency (Avrg) as the dependent variable (2x2x8
contingency table).
> ct<-xtabs(Avrg~Time+Depth+Season,data=HG03.dat)
> mantelhaen.test(ct)
Cochran-Mantel-Haenszel test
data: ct
Cochran-Mantel-Haenszel M^2 = 28.4548, df = 7, p-value = 0.0001818
> ct<-xtabs(Avrg~Season+Depth+Time,data=HG03.dat)
> mantelhaen.test...