med2way function

A two-way ANOVA for medians.

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

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.

Returns

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")