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}
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}
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\seealso{
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\seealso{
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  \code{\link{update.formula}}
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  \code{\link{update.formula}}
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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. (1992)
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  \emph{Linear models.}
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  \bibshow{R:Chambers:1992:c4}}
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  Chapter 4 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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\examples{
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\examples{
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oldcon <- options(contrasts = c("contr.treatment", "contr.poly"))
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oldcon <- options(contrasts = c("contr.treatment", "contr.poly"))
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## Annette Dobson (1990) "An Introduction to Generalized Linear Models".
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## Annette Dobson (1990) "An Introduction to Generalized Linear Models".
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## Page 9: Plant Weight Data.
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## Page 9: Plant Weight Data.
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ctl <- c(4.17,5.58,5.18,6.11,4.50,4.61,5.17,4.53,5.33,5.14)
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ctl <- c(4.17,5.58,5.18,6.11,4.50,4.61,5.17,4.53,5.33,5.14)