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  on.  This is the reverse of lexicographic ordering (which you can get
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  on.  This is the reverse of lexicographic ordering (which you can get
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  by  \code{lex.order = TRUE}), and differs from
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  by  \code{lex.order = TRUE}), and differs from
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  \code{\link{:}}.  (It is done this way for compatibility with S.)
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  \code{\link{:}}.  (It is done this way for compatibility with S.)
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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}
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  \emph{Statistical Models in S}.
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  Wadsworth & Brooks/Cole.
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}
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}
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\seealso{
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\seealso{
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  \code{\link{factor}};
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  \code{\link{factor}};
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  \code{\link{:}} where \code{f:g} is similar to
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  \code{\link{:}} where \code{f:g} is similar to
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  \code{interaction(f, g, sep = ":")} when \code{f} and  \code{g} are factors.
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  \code{interaction(f, g, sep = ":")} when \code{f} and  \code{g} are factors.