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  Nothing sensible happens for interaction terms.
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  Nothing sensible happens for interaction terms.
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}
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}
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\seealso{For (generalized) linear models, \code{\link{plot.lm}} and
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\seealso{For (generalized) linear models, \code{\link{plot.lm}} and
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  \code{\link{predict.glm}}.}
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  \code{\link{predict.glm}}.}
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\examples{
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\examples{
- 
 
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require(graphics)
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had.splines <- "package:splines" \%in\% search()
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had.splines <- "package:splines" \%in\% search()
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if(!had.splines) rs <- require(splines)
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if(!had.splines) rs <- require(splines)
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x <- 1:100
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x <- 1:100
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z <- factor(rep(LETTERS[1:4],25))
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z <- factor(rep(LETTERS[1:4],25))
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y <- rnorm(100,sin(x/10)+as.numeric(z))
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y <- rnorm(100,sin(x/10)+as.numeric(z))