WRS2 (version 0.3-1)

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)
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.

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
• 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

t1way(libido ~ dose, data = viagra)

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