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  \code{drop.terms} removes variables from the right-hand side of the
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  \code{drop.terms} removes variables from the right-hand side of the
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  model. There is also a \code{"[.terms"} method to perform the same
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  model. There is also a \code{"[.terms"} method to perform the same
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  function (with \code{keep.response = TRUE}).
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  function (with \code{keep.response = TRUE}).
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  \code{reformulate} creates a formula from a character vector. If
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  \code{reformulate} creates a formula from a character vector.  If
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  \code{length(termlabels)}>1, its elements are concatenated with \code{+}.
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  \code{length(termlabels) > 1}, its elements are concatenated with \code{+}.
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  Non-syntactic names (e.g. containing spaces or special characters; see
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  Non-syntactic names (e.g. containing spaces or special characters; see
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  \code{\link{make.names}}) must be protected with backticks  (see examples).
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  \code{\link{make.names}}) must be protected with backticks  (see examples).
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  A non-\code{\link{parse}}able \code{response} still works for now,
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  back compatibly, with a deprecation warning.
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}
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}
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\value{
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\value{
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  \code{delete.response} and \code{drop.terms} return a \code{terms}
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  \code{delete.response} and \code{drop.terms} return a \code{terms}
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  object.
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  object.
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