Extract design matrix — design • targeted

Extract design matrix from data.frame and formula

design(
  formula,
  data,
  ...,
  intercept = FALSE,
  response = FALSE,
  rm_envir = FALSE,
  specials = NULL,
  specials.call = NULL,
  xlev = NULL,
  design.matrix = TRUE
)

Arguments

formula: formula
data: data.frame
...: additional arguments (e.g, specials such weights, offsets, ...)
intercept: (logical) If FALSE an intercept is not included in the design matrix
response: (logical) if FALSE the response variable is dropped
rm_envir: Remove environment
specials: character vector specifying functions in the formula that should be marked as special in the terms object
specials.call: (call) specials optionally defined as a call-type
xlev: a named list of character vectors giving the full set of levels to be assumed for each factor
design.matrix: (logical) if FALSE then only response and specials are returned. Otherwise, the design.matrix x is als part of the returned object.

Value

An object of class 'design'

Author

Klaus Kähler Holst