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  its value) and finally a \code{"formula"} attribute.
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  its value) and finally a \code{"formula"} attribute.
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  There is a \code{formula} method for data frames.  When there's
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  There is a \code{formula} method for data frames.  When there's
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  \code{"terms"} attribute with a formula, e.g., for a
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  \code{"terms"} attribute with a formula, e.g., for a
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  \code{\link{model.frame}()}, that formula is returned.  If you'd like the
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  \code{\link{model.frame}()}, that formula is returned.  If you'd like the
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  previous (\R \eqn{\le}{<=} 3.5.x) behavior, use the auxiliary
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  previous (\R \eqn{\le} 3.5.x) behavior, use the auxiliary
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  \code{DF2formula()} which does not consider a \code{"terms"} attribute.
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  \code{DF2formula()} which does not consider a \code{"terms"} attribute.
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  Otherwise, if
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  Otherwise, if
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  there is only
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  there is only
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  one column this forms the RHS with an empty LHS.  For more columns,
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  one column this forms the RHS with an empty LHS.  For more columns,
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  the first column is the LHS of the formula and the remaining columns
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  the first column is the LHS of the formula and the remaining columns