med1way: Heteroscedastic one-way ANOVA for medians.

Description Usage Arguments Details Value References See Also Examples

View source: R/med1way.R

Description

This function computes a one-way ANOVA for the medians. Homoscedasticity assumption not required. There shouldn't be too many ties.

Usage

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med1way(formula, data, iter = 1000)

Arguments

formula

an object of class formula.

data

an optional data frame for the input data.

iter

number of iterations to determine critical value.

Details

Evaluating the test statistic using the df proposed in the literature can result in the actual level being less than the nominal level, (i.e., around 0.02-0.025 when testing at the 0.05 level and the sample size is small). A better strategy is to simulate the critical value and computing the p-value accordingly, as implemented in this function.

Value

Returns an object of class med1way containing:

test

F-value of the test statistic

crit.val

critical value

p.value

p-value

call

function call

References

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

See Also

t1way,t1waybt, Qanova

Examples

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set.seed(123)
med1way(libido ~ dose, data = viagra, iter = 3000)

WRS2 documentation built on May 4, 2018, 3 a.m.