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Return the variables used for estimating a sample selection model
# S3 method for selection model.frame(formula, ... )
A data.frame containing all variables used for the estimation. The
“terms” attribute contains the terms for the selection equation.
object of class selection.
selection
further arguments passed to other methods (e.g. model.frame or model.frame.binaryChoice).
model.frame
model.frame.binaryChoice
Arne Henningsen
model.frame, selection, model.matrix.selection, and selection-methods.
model.matrix.selection
selection-methods