dummy

0th

Percentile

Dummy variables (experimental)

Largely a wrapper for model.matrix that accepts a factor, f, and returns a dummy matrix with nlevels(f)-1 columns (the first column is dropped by default). Useful whenever one wishes to avoid the behaviour of model.matrix of always returning an nlevels(f)-column matrix, either by the addition of an intercept column, or by keeping one column for all levels.

Usage
dummy(f, levelsToKeep)
Arguments
f

An object coercible to factor.

levelsToKeep

An optional character vector giving the subset of levels(f) to be converted to dummy variables.

Value

A model.matrix with dummy variables as columns.

Aliases
  • dummy
Examples
# NOT RUN {
data(Orthodont,package="nlme")
lmer(distance ~ age + (age|Subject) +
     (0+dummy(Sex, "Female")|Subject), data = Orthodont)
# }
Documentation reproduced from package lme4, version 1.1-21, License: GPL (>= 2)

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