estimateNumPerm {sigPathway} | R Documentation

## Compute the Number of Unique Permutations for a Phenotype Vector

### Description

Computes the number of unique permutations based on a vector of phenotypes and the number of groups.

### Usage

    estimateNumPerm(phenotype, ngroups)

### Arguments

`phenotype` | a numeric (or character if `ngroups` >= 2) vector indicating the phenotype
`ngroups` | an integer indicating the number of groups in the phenotype

### Details

This function calculates the number of unique permutations based on the given phenotype and the number of groups present in the phenotype. This function is used internally in `sigPathway` and attempts to avoid numeric overflow associated with multiplying out large factorials.

### Value

A numeric with length 1.

### Author(s)

Weil Lai

### Examples

    ## One group: continuous observations
    ptype1 <- c(24,25,17,26,25,16,14,17,12,15,19,20)
    print(estimateNumPerm(ptype1, 1))

    ## Two groups
    ptype2 <- c(0,1,1,0,1,0,1)
    print(estimateNumPerm(ptype2, 2))

    ## Three groups
    ptype3a <- c(2,0,1,2,0,1,2,0,0,1,1,2)
    print(estimateNumPerm(ptype3a, 3))

    ptype3b <- c("Banana","Apple","Lemon","Lemon","Lemon",
                 "Apple","Lemon","Banana","Banana")
    print(estimateNumPerm(ptype3b, 3))

[Package sigPathway version 1.4.0 Index]