R: Convert groupedData to a matrix

asTable {nlme} | R Documentation

## Convert groupedData to a matrix

### Description

Create a tabular representation of the response in a balanced groupedData object.

### Usage

    asTable(object)

### Arguments

`object` | A balanced `groupedData` object

### Details

A balanced groupedData object can be represented as a matrix or table of response values corresponding to the values of a primary covariate for each level of a grouping factor. This function creates such a matrix representation of the data in `object`.

### Value

A matrix. The data in the matrix are the values of the response. The columns correspond to the distinct values of the primary covariate and are labelled as such. The rows correspond to the distinct levels of the grouping factor and are labelled as such.

### Author(s)

José Pinheiro and Douglas Bates bates@stat.wisc.edu

### References

Pinheiro, J. C. and Bates, D. M. (2000), Mixed-Effects Models in S and S-PLUS, Springer, New York.

### See Also

`groupedData`, `isBalanced`, `balancedGrouped`

### Examples

    asTable(Orthodont)

    # Pinheiro and Bates, p. 109
    ergoStool.mat <- asTable(ergoStool)

[Package nlme version 3.1-118 Index]