permTestAnova: Permutation test for ANOVA F-test

Description

Permutation test to see if the population mean is the same for two or more populations. For instance, test \(latex\) where \(latex\) denotes the population mean. The values of the numeric variable are randomly assigned to the groups and the ANOVA F statistic is calculated. The command will print the mean and standard error of the distribution of the test statistic as well as a P-value.

Usage

permTestAnova(x, ...)
# S3 method for default
permTestAnova(
  x,
  group,
  B = 9999,
  plot.hist = TRUE,
  plot.qq = FALSE,
  xlab = NULL,
  ylab = NULL,
  title = NULL,
  seed = NULL,
  ...
)
# S3 method for formula
permTestAnova(formula, data = parent.frame(), subset, ...)

Value

Returns invisibly a vector of the replicates of the test statistic.

Arguments

x: a numeric vector.
...: further arguments to be passed to or from methods.
group: a factor variable with two or more levels. If group is a numeric vector, it will be coerced into a factor variable.
B: the number of resamples (positive integer greater than 2).
plot.hist: a logical value. If TRUE, the permutation distribution of the statistic is plotted.
plot.qq: a logical value. If TRUE, then a normal quantile-quantile plot of the resampled test statistic is created.
xlab: an optional character string for the x-axis label
ylab: an optional character string for the y-axis label
title: an optional character string giving the plot title
seed: optional argument to set.seed
formula: a formula of the form y ~ group where y is numeric and group is a factor variable.
data: a data frame with the variables in the formula.
subset: an optional expression specifying which observations to keep.

Methods (by class)

permTestAnova(default): Permutation test for ANOVA F-test
permTestAnova(formula): Permutation test for ANOVA F-test

Author

Adam Loy, Laura Chihara

Details

Observations with missing values are removed.

References

Tim Hesteberg's website: https://www.timhesterberg.net/bootstrap-and-resampling

Examples

Run this code


permTestAnova(states03$ViolentCrime, states03$Region, B = 499)

#using formula syntax
if (FALSE) {
permTestAnova(ViolentCrime ~ Region, data = states03, B = 9999)
}

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