WRS2 (version 0.9-2)

t1way: A heteroscedastic one-way ANOVA for trimmed means.

Description

The t1way function computes a one-way ANOVA for the medians. Homoscedasticity assumption not required. It uses a generalization of Welch's method. Corresponding post hoc tests can be performed using lincon.

Usage

t1way(formula, data, tr = 0.2, nboot = 100)
lincon(formula, data, tr = 0.2)

Arguments

formula

an object of class formula.

data

an optional data frame for the input data.

tr

trim level for the mean.

nboot

number of bootstrap samples.

Value

t1way returns an object of class "t1way" containing:

test

value of the test statistic (F-statistic)

df1

degrees of freedom

df2

degrees of freedom

p.value

p-value

effsize

explanatory measure of effect size

call

function call

lincon returns an object of class "mcp1" containing:

comp

inference for all pairwise comparisons

fnames

names of the factor levels

Details

In the post hoc computations, confidence intervals are adjusted to control FWE, but p-values are not adjusted to control FWE.

References

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

See Also

med1way,t1waybt

Examples

# NOT RUN {
t1way(libido ~ dose, data = viagra)

## post hoc tests
lincon(libido ~ dose, data = viagra)
# }