dummies (version 1.03)

which.dummy: Identify which columns are dummy variables on a data frame.

Description

Given a data frame and an optional variable name, which.dummy identifies which colummns are dummy variables by the column index.

Usage

which.dummy(data, name=NULL)

Arguments

data

An object with a 'dummies' attribute

name

Optional. The name of a column that has been expanded to a dummy variable.

Value

• integer vector of column indices corresponding to the dummy variable(s)

Details

Given a data frame and an optional variable name, returns the indices of the dummy columns.

Requires an dummies attribute, usually created by dummy.data.frame.

See Also

dummy.data.frame, dummy

Examples

data(iris)
  dat <- dummy.data.frame(iris)
  which.dummies(dat)