treeperm (version 1.6)

Permutation: Two Sample Exact Permutation Test

Description

This function performs a two sample permutation test of data locations by returning a p value. It is a wrapper function for C level computations. Users are not expected to use this function directly because there is no error checking mechanisms. However, for purpose of performance testing and other demands, this function is visible in this package.

Usage

Permutation(data, factor)
"print"(x,...)

Arguments

x

The Permutation class to be printed.

data

The set of all data to be permuted

factor

The set of indices, indicating group assignments of values in vector data. This parameter should be in factor type..

...

Reserved for future.

Value

Statistics

The observed test statistics for input data. It is the sum of all elements in first group.

Permutations

The total number of permutations can be performed on input groups.

pvalue

The p value of this two sample permutation test.

Details

Details about implementations are located in Permutation.c.

References

Fisher, R. A. 1925, 'Statistical Methods for Research Workers', Oliver and Boyd, Edinburgh

Examples

value<-c(0,190,0,0,10,0,0,0,0,0,0,110,0,0,52,0,8,0,50,0,0,137,965,110)
label<-as.factor(c(1,1,1,2,2,2,1,1,1,2,2,2,1,1,1,2,2,2,1,1,1,2,2,2))
print(Permutation(value,label))