Two Sample Permutation Test

Description

This function computes the p-value for the two sample t-test using a permutation test. The permutation density can also be plotted.

Usage

twotPermutation(x1 = DAAG::two65$ambient, x2 = DAAG::two65$heated, nsim = 2000,
plotit = TRUE)

Arguments

Details

Suppose we have n1 values in one group and n2 in a second, with n = n1 + n2. The permutation distribution results from taking all possible samples of n2 values from the total of n values.

Value

The p-value for the test of the hypothesis that the mean of x1 differs from x2

Author(s)

J.H. Maindonald

References

Good, P. 2000. Permutation Tests. Springer, New York.

Examples

twotPermutation()

Results

R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> library(DAAG)
Loading required package: lattice
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/DAAG/twotPermutation.Rd_%03d_medium.png", width=480, height=480)
> ### Name: twotPermutation
> ### Title: Two Sample Permutation Test
> ### Aliases: twotPermutation
> ### Keywords: models
> 
> ### ** Examples
> 
> twotPermutation()
p-value: 
   0.058 
> 
> 
> 
> 
> 
> dev.off()
null device 
          1 
>