dummy {rchemo}

Table of dummy variables

Description

The function builds a table of dummy variables from a qualitative variable. A binary (i.e. 0/1) variable is created for each level of the qualitative variable.

Usage

dummy(y)

Arguments

y

A qualitative variable.

Value

Y

A matrix of dummy variables (i.e. binary variables), each representing a given level of the qualitative variable.

lev

levels of the qualitative variable.

ni

number of observations per level of the qualitative variable.

Examples

y <- c(1, 1, 3, 2, 3)
dummy(y)

y <- c("B", "a", "B")
dummy(y)
dummy(as.factor(y))