cmat {daMA} | R Documentation

## Contrast matrix describing the experimental questions

### Description

This matrix of numerical constants describes the experimental question, p say. Each experimental question is described by a single contrast vector (a single row in cmat) or by a contrast matrix (several rows in cmat). The ordering of the columns corresponds to that of the associated design matrix X. Thus, typically the first two elements in a row of cmat are reserved for for the two dyes. E.g. to compare the two dyes, we set (-1, 1, 0, ..., 0).

### Usage

    data(cmat)

### Format

### Details

### Source

### References

Bretz, F and Landgrebe J and Brunner E (2003):"Design and analysis of two colour factorial microarray experiments", submitted.

### Examples

    data(cmat)
    ## maybe str(cmat) ; plot(cmat) ...

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