Test for an interaction in two-way ANOVA table by the Tukey test.
level of the test
The critical value can be computed in advance and given in the parameter
If not a function
critical.values is called to do that.
A list with class "
aTest" containing the following components:
stat, critical value
critical.value and the result of
result, i.e. whether the additivity hypothesis has been rejected.
Tukey, J.W.: One Degree of Freedom for Non-additivity, Biometrics 5, pp. 232–242, 1949.
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