dummy | R Documentation |
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.
dummy(f, levelsToKeep)
f |
An object coercible to |
levelsToKeep |
An optional character vector giving the subset of
|
A model.matrix
with dummy variables as columns.
data(Orthodont,package="nlme")
lmer(distance ~ age + (age|Subject) +
(0+dummy(Sex, "Female")|Subject), data = Orthodont)
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