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  \code{\link{factor}}, \code{\link{contr.treatment}},
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  \code{\link{factor}}, \code{\link{contr.treatment}},
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  \code{\link{levels}}, \code{\link{reorder}}.
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  \code{\link{levels}}, \code{\link{reorder}}.
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}
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}
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\examples{
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\examples{
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warpbreaks$tension <- relevel(warpbreaks$tension, ref="M")
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warpbreaks$tension <- relevel(warpbreaks$tension, ref = "M")
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summary(lm(breaks ~ wool + tension, data=warpbreaks))
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summary(lm(breaks ~ wool + tension, data = warpbreaks))
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}
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}
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\keyword{utilities}
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\keyword{utilities}
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\keyword{models}
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\keyword{models}