model.frame.selection {sampleSelection}

Data of Selection Models

Description

Return the variables used for estimating a sample selection model

Usage

## S3 method for class 'selection'
model.frame(formula, ... )

Arguments

formula

object of class selection.

...

further arguments passed to other methods (e.g. model.frame or model.frame.binaryChoice).

Value

A data.frame containing all variables used for the estimation. The “terms” attribute contains the terms for the selection equation.

Author(s)

Arne Henningsen

See Also

model.frame, selection, model.matrix.selection, and selection-methods.