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\seealso{
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\seealso{
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  \code{\link{step}}, \code{\link{aov}}, \code{\link{lm}},
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  \code{\link{step}}, \code{\link{aov}}, \code{\link{lm}},
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  \code{\link{extractAIC}}, \code{\link{anova}}
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  \code{\link{extractAIC}}, \code{\link{anova}}
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}
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}
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\examples{
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\examples{
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\testonly{od <- options(digits = 5)}
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\dontshow{od <- options(digits = 5)}
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require(graphics); require(utils)
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require(graphics); require(utils)
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## following example(swiss)
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## following example(swiss)
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lm1 <- lm(Fertility ~ ., data = swiss)
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lm1 <- lm(Fertility ~ ., data = swiss)
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add1(lm1, ~ I(Education^2) + .^2)
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add1(lm1, ~ I(Education^2) + .^2)
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drop1(lm1, test = "F")  # So called 'type II' anova
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drop1(lm1, test = "F")  # So called 'type II' anova
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## following example(glm)
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## following example(glm)
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\dontshow{example(glm, echo = FALSE)}
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\dontshow{example(glm, echo = FALSE)}
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drop1(glm.D93, test = "Chisq")
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drop1(glm.D93, test = "Chisq")
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drop1(glm.D93, test = "F")
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drop1(glm.D93, test = "F")
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add1(glm.D93, scope = ~outcome*treatment, test = "Rao") ## Pearson Chi-square
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add1(glm.D93, scope = ~outcome*treatment, test = "Rao") ## Pearson Chi-square
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\testonly{options(od)}
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\dontshow{options(od)}
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}
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}
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\keyword{models}
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\keyword{models}