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  The aliasing pattern may depend on the contrasts in use: \I{Helmert}
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  The aliasing pattern may depend on the contrasts in use: \I{Helmert}
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  contrasts are probably most useful.
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  contrasts are probably most useful.
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  The defaults are different from those in S.
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  The defaults are different from those in S.
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}
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}
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\references{
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  \bibshow{R:Chambers+Freeny+Heiberger:1992}
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}
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\author{
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\author{
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  The design was inspired by the S function of the same name described
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  The design was inspired by the S function of the same name described
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  in Chambers \abbr{et al.}\sspace(1992).
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  in \bibcitet{R:Chambers+Freeny+Heiberger:1992}..
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}
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\references{
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  \bibshow{R:Chambers+Freeny+Heiberger:1992}
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}
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}
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\examples{\donttest{% as it loads  MASS
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\examples{\donttest{% as it loads  MASS
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op <- options(contrasts = c("contr.helmert", "contr.poly"))
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op <- options(contrasts = c("contr.helmert", "contr.poly"))
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npk.aov <- aov(yield ~ block + N*P*K, npk)
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npk.aov <- aov(yield ~ block + N*P*K, npk)
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alias(npk.aov)
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alias(npk.aov)