Extract design matrix

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