This function computes a two-way ANOVA medians with interactions effects.
Usage
med2way(formula, data, ...)
Value
Returns an object of class t2way containing:
Qa
first main effect
A.p.value
p-value first main effect
Qb
second main effect
B.p.value
p-value second main effect
Qab
interaction effect
AB.p.value
p-value interaction effect
call
function call
varnames
variable names
dim
design dimensions
Arguments
formula
an object of class formula.
data
an optional data frame for the input data.
...
currently ignored.
Details
There should not be too many ties in the data. The test statistics for the main effects in med2way are F-distributed, the (heteroscedastic) test for the interaction is chi-square distributed. Post hoc tests can be performed using
mcp2a.
References
Wilcox, R. (2012). Introduction to Robust Estimation and Hypothesis Testing (3rd ed.). Elsevier.