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  Wadsworth & Brooks/Cole.
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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.
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}
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}
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\examples{
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\examples{
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a <- gl(2, 4, 8)
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a <- gl(2, 4, 8)
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b <- gl(2, 2, 8, labels = c("ctrl", "treat"))
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b <- gl(2, 2, 8, labels = c("ctrl", "treat"))
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s <- gl(2, 1, 8, labels = c("M", "F"))
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s <- gl(2, 1, 8, labels = c("M", "F"))