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  the extra variables may contain \code{NA}.
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  the extra variables may contain \code{NA}.
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}
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}
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\value{
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\value{
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  A data frame.
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  A data frame.
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}
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}
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\seealso{\code{\link{model.frame}},\code{\link{predict}}}
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\seealso{\code{\link{model.frame}}, \code{\link{predict}}}
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\examples{
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\examples{
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model <- lm(log(Volume) ~ log(Girth) + log(Height), data = trees)
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model <- lm(log(Volume) ~ log(Girth) + log(Height), data = trees)
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expand.model.frame(model, ~ Girth) # prints data.frame like
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expand.model.frame(model, ~ Girth) # prints data.frame like
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