R: Pairwise Contrasts

Contrasts {DescTools} | R Documentation

## Pairwise Contrasts

### Description

Generate all pairwise contrasts for using in a post-hoc test, e.g. ScheffeTest.

### Usage

    Contrasts(levs)

### Arguments

`levs` | the levels to be used

### Value

A matrix with all possible pairwise contrasts, that can be built with the given levels.

### Author(s)

Andri Signorell <andri@signorell.net>

### See Also

`ScheffeTest`

### Examples

    Contrasts(LETTERS[1:5])

    #   B-A C-A D-A E-A C-B D-B E-B D-C E-C E-D
    # A  -1  -1  -1  -1   0   0   0   0   0   0
    # B   1   0   0   0  -1  -1  -1   0   0   0
    # C   0   1   0   0   1   0   0  -1  -1   0
    # D   0   0   1   0   0   1   0   1   0  -1
    # E   0   0   0   1   0   0   1   0   1   1

[Package DescTools version 0.99.26 Index]