dummy: Table of dummy variables

In rchemo: Dimension Reduction, Regression and Discrimination for Chemometrics

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))

rchemo documentation built on Sept. 11, 2024, 8:05 p.m.