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  level (so that \code{NA} values are counted in tables, for instance).
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  level (so that \code{NA} values are counted in tables, for instance).
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  \code{.valid.factor(object)} checks the validity of a factor,
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  \code{.valid.factor(object)} checks the validity of a factor,
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  currently only \code{levels(object)}, and returns \code{TRUE} if it is
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  currently only \code{levels(object)}, and returns \code{TRUE} if it is
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  valid, otherwise a string describing the validity problem.  This
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  valid, otherwise a string describing the validity problem.  This
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  function is used for \code{\link{validObject}(<factor>)}.
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  function is used for \code{\link{validObject}(\var{factor})}.
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}
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}
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\details{
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\details{
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  The type of the vector \code{x} is not restricted; it only must have
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  The type of the vector \code{x} is not restricted; it only must have
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  an \code{\link{as.character}} method and be sortable (by
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  an \code{\link{as.character}} method and be sortable (by
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  \code{\link{order}}).
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  \code{\link{order}}).