Extract design matrix from data.frame and formula

```
design(
formula,
data,
intercept = FALSE,
rm_envir = FALSE,
...,
specials = c("weights", "offset")
)
```

## Arguments

- formula
formula

- data
data.frame

- intercept
If FALSE (default) an intercept is not included

- rm_envir
Remove environment

- ...
additional arguments (e.g, specials such weights, offsets,
subset)

## Value

An object of class 'design'

## Author

Klaus Kähler Holst