Extract design matrix from data.frame and formula

design(formula, data, intercept = FALSE, rm_envir = FALSE, ...)

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