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}
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}
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\seealso{
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\seealso{
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  \code{\link{contrasts}}, \code{\link{contr.sum}}, etc.
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  \code{\link{contrasts}}, \code{\link{contr.sum}}, etc.
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}
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}
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\references{
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\references{
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  Chambers, J. M. and Hastie, T. J. (1992)
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  \bibshow{R:Chambers+Hastie:1992:c2}
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  \emph{Statistical models.}
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  Chapter 2 of \emph{Statistical Models in S}
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  eds J. M. Chambers and T. J. Hastie, Wadsworth & Brooks/Cole.
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}
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}
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\examples{
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\examples{
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## reset contrasts to defaults
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## reset contrasts to defaults
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options(contrasts = c("contr.treatment", "contr.poly"))
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options(contrasts = c("contr.treatment", "contr.poly"))
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tens <- with(warpbreaks, C(tension, poly, 1))
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tens <- with(warpbreaks, C(tension, poly, 1))