biostat3 (version 0.1.4)

addIndicators: Utility to add indicators from a data-frame based on a formula.

Description

Column-bind a model matrix to the source data-frame

Usage

addIndicators(data, formula, drop.intercept = TRUE)

Arguments

data

source data-frame or matrix.

formula

model formula used to add columns.

drop.intercept

logical as to whether to drop the column named '(Intercept)'.

Value

data-frame or matrix.

Details

This function calls model.matrix, conditionally checks for and removes '(Intercept)', and binds with the original data-frame (or matrix).

Examples

# NOT RUN {
addIndicators(data.frame(f = c("a","a","b")), ~f+0)
# }