| contr.dummy {kknn} | R Documentation |
Contrast Matrices
Description
Returns a matrix of contrasts.
Usage
contr.dummy(n, contrasts = TRUE)
contr.ordinal(n, contrasts = TRUE)
contr.metric(n, contrasts = TRUE)
Arguments
n |
A vector containing levels of a factor, or the number of levels. |
contrasts |
A logical value indicating whether contrasts should be computed. |
Details
contr.dummy is standard dummy-coding, contr.metric has the same
effect like as.numeric (makes sense of course only for ordered variables).
contr.ordinal computes contrasts for ordinal variables.
Value
A matrix with n rows and n-1 columns for contr.ordinal,
a matrix with n rows and n columns for contr.dummy
and a vector of length n for contr.metric.
Author(s)
Klaus P. Schliep klaus.schliep@gmail.com
References
Hechenbichler K. and Schliep K.P. (2004) Weighted k-Nearest-Neighbor Techniques and Ordinal Classification, Discussion Paper 399, SFB 386, Ludwig-Maximilians University Munich (http://www.stat.uni-muenchen.de/sfb386/papers/dsp/paper399.ps)
See Also
contrasts, contr.poly and contr.sdif
Examples
contr.metric(5)
contr.ordinal(5)
contr.dummy(5)