The Essential R Reference by Mark Gardener

Author:Mark Gardener
Language: eng
Format: epub, pdf
Publisher: Wiley Publishing, Inc.
Published: 2012-10-23T04:00:00+00:00

Common Usage

contrasts(x, contrasts = TRUE, sparse = FALSE) contrasts(x, how.many) <- value C(object, contr, how.many, ...) contr.helmert(n, contrasts = TRUE, sparse = FALSE) contr.poly(n, scores = 1:n, contrasts = TRUE, sparse = FALSE) contr.sum(n, contrasts = TRUE, sparse = FALSE) contr.treatment(n, base = 1, contrasts = TRUE, sparse = FALSE) contr.SAS(n, contrasts = TRUE, sparse = FALSE)

Related Commands

aov

lm

glm

Command Parameters

x A factor or logical variable.

contrasts = TRUE If contrasts = FALSE, an identity matrix is returned. If contrasts = TRUE, the contrasts are returned from the current contrasts option. The parameter is ignored if x is a matrix with a contrasts attribute.

sparse = FALSE If TRUE, a sparse matrix is returned.

how.many The number of contrasts to create; defaults to one less than the number of levels in x.

object A factor (can be ordered).

contr Which contrasts to use. This can be given as a matrix with one row for each level of the factor or a suitable function like contr.xxxx or a character string giving the name of the function.

... Additional parameters to pass to contr.xxxx.

n A vector of levels for a factor or the number of levels required.

scores = 1:n The set of values over which orthogonal polynomials are to be computed.

base An integer specifying which group is considered the baseline group. Ignored if contrasts is FALSE.

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