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

t1way {WRS2} | R Documentation

## 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.

### Details

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

### 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

### References

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

### See Also

`med1way`,`t1waybt`

### Examples

    t1way(libido ~ dose, data = viagra)

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

[Package WRS2 version 0.9-2 Index]