dfidx (version 0.1-0)

model.frame.dfidx: model.frame/matrix for dfidx objects

Description

Specific model.frame/matrix are provided for dfidx objects. This leads to an unusual order of arguments compared to the usage. Actually, the first two arguments of the model.frame method are a dfidx and a formula and the only main argument of the model.matrix is a dfidx which should be the result of a call to the model.frame method, i.e. it should have a term attribute.

Usage

# S3 method for dfidx
model.frame(
  formula,
  data = NULL,
  ...,
  lhs = NULL,
  rhs = NULL,
  dot = "previous",
  alt.subset = NULL,
  reflevel = NULL,
  balanced = FALSE
)
# S3 method for dfidx
model.matrix(object, ..., lhs = NULL, rhs = 1, dot = "separate")
# S3 method for dfidx_matrix
print(x, ..., n = 10L)

Value

a dfidx object for the model.frame method and a matrix for the model.matrix method.

Arguments

formula

a dfidx

data

a formula

..., lhs, rhs, dot

see the Formula method

alt.subset

a subset of levels for the second index

reflevel

a user-defined first level for the second index

balanced

a boolean indicating if the resulting data.frame has to be balanced or not

object

a dfidx object

x

a model matrix

n

the number of lines to print

Author

Yves Croissant

Examples

mn <- dfidx(munnell)
mf <- model.frame(mn, gsp ~ privatecap | publiccap + utilities | unemp + labor)
model.matrix(mf, rhs = 1)
model.matrix(mf, rhs = 2)
model.matrix(mf, rhs = 1:3)