R: Construct a design matrix

model_matrix {modelr} | R Documentation

## Construct a design matrix

### Description

This is a thin wrapper around `stats::model.matrix()` which returns a tibble. Use it to determine how your modelling formula is translated into a matrix, an thence into an equation.

### Usage

    model_matrix(data, formula, ...)

### Arguments

`data` | A data frame
`formula` | A modelling formula
`...` | Other arguments passed onto `stats::model.matrix()`

### Value

A tibble.

### Examples

    model_matrix(mtcars, mpg ~ cyl)
    model_matrix(iris, Sepal.Length ~ Species)
    model_matrix(iris, Sepal.Length ~ Species - 1)

[Package modelr version 0.1.2 Index]