med2way: A two-way ANOVA for medians.

In WRS2: A Collection of Robust Statistical Methods

A two-way ANOVA for medians.

Description

This function computes a two-way ANOVA medians with interactions effects.

Usage

med2way(formula, data, ...)

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.

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

References

Wilcox, R. (2012). Introduction to Robust Estimation and Hypothesis Testing (3rd ed.). Elsevier.

See Also

t2way, med1way

Examples

med2way(attractiveness ~ gender*alcohol, data = goggles)
mcp2a(attractiveness ~ gender*alcohol, data = goggles, est = "median")

WRS2 documentation built on March 19, 2024, 3:08 a.m.