RVAideMemoire (version 0.9-45-2)

fp.test: Fligner-Policello test

Description

Performs a Fligner-Policello test of the null that the medians in the two groups (samples) are the same.

Usage

fp.test(x, ...)

## S3 method for class 'default':
fp.test(x, y, delta = 0, alternative = "two.sided", ...)

## S3 method for class 'formula':
fp.test(formula, data, subset, ...)

Arguments

x

a numeric vector of data values.

y

a numeric vector of data values.

delta

null difference in medians tested.

alternative

a character string specifying the alternative hypothesis, must be one of "two.sided" (default), "greater" or "less".

formula

a formula of the form a ~ b, where a and b give the data values and corresponding groups.

data

an optional data frame containing the variables in the formula formula. By default the variables are taken from environment(formula).

subset

an optional vector specifying a subset of observations to be used.

...

further arguments to be passed to or from other methods.

Value

• statistic
  test statistics.
• p.value
  p-value of the test.
• alternative
  a character string describing the alternative hypothesis.
• method
  a character string indicating the name of the test.
• data.name
  a character string giving the names of the data.
• null.value
  the specified hypothesized value of the median difference.

Details

The Fligner-Policello test does not assume that the shape of the distribution is similar in two groups, contrary to the Mann-Whitney-Wilcoxon test. However, it assumes that the the distributions are symmetric.

See Also

fp.test, wilcox.test

Examples

x <- rpois(20,3)
y <- rpois(20,5)
fp.test(x,y)