useknd {SHT}

Apply k-sample tests for two multivariate samples

Description

Any k-sample method implies that it can be used for a special case of k=2. useknd lets any k-sample tests provided in this package be used with two multivariate samples X and Y.

Usage

useknd(X, Y, test.name, ...)

Arguments

X

an (n_x \times p) data matrix of 1st sample.

Y

an (n_y \times p) data matrix of 2nd sample.

test.name

character string for the name of k-sample test to be used.

...

extra arguments passed onto the function test.name.

Value

a (list) object of S3 class htest containing:

statistic

a test statistic.

p.value

p-value under H_0.

alternative

alternative hypothesis.

method

name of the test.

data.name

name(s) of provided sample data.

Examples

## use 'covk.2007Schott' for two-sample covariance testing
## empirical Type 1 error 
niter   = 1000
counter = rep(0,niter)  # record p-values
for (i in 1:niter){
  X = matrix(rnorm(50*5), ncol=10)
  Y = matrix(rnorm(50*5), ncol=10)
  
  counter[i] = ifelse(useknd(X,Y,"covk.2007Schott")$p.value < 0.05, 1, 0)
}

## print the result
cat(paste("\n* Example for 'covk.2007Schott'\n","*\n",
"* number of rejections   : ", sum(counter),"\n",
"* total number of trials : ", niter,"\n",
"* empirical Type 1 error : ",round(sum(counter/niter),5),"\n",sep=""))