t1waybt function

Bootstrap version of the heteroscedastic one-way ANOVA for trimmed means.

Test the hypothesis of equal trimmed means using a percentile t bootstrap method. Corresponding post hoc tests are provided in mcppb20.

t1waybt(formula, data, tr = 0.2, nboot = 599, ...)
mcppb20(formula, data, tr = 0.2, nboot = 599, ...)

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.
• ...: currently ignored.

Returns

Returns an object of class t1waybt containing:

• test: value of the test statistic

• p.value: p-value

• Var.Explained: explained amount of variance

• Effect.Size: effect size

• nboot.eff: effective number of bootstrap samples

• call: function call

mcppb20 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

t1way,med1way

Examples

t1waybt(libido ~ dose, data = viagra)

## post hoc
mcppb20(libido ~ dose, data = viagra)