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  examples), and the class attribute (see \code{\link{oldClass}}) of the
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  examples), and the class attribute (see \code{\link{oldClass}}) of the
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  result is taken from \code{test} and may be inappropriate for the
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  result is taken from \code{test} and may be inappropriate for the
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  values selected from \code{yes} and \code{no}.
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  values selected from \code{yes} and \code{no}.
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  Sometimes it is better to use a construction such as
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  Sometimes it is better to use a construction such as
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  \code{(tmp <- yes; tmp[!test] <- no[!test]; tmp)}, possibly extended
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\preformatted{  (tmp <- yes; tmp[!test] <- no[!test]; tmp)
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  to handle missing values in \code{test}.
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}, possibly extended to handle missing values in \code{test}.
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}
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}
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\references{
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\references{
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  \emph{The New S Language}.
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  \emph{The New S Language}.
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  Wadsworth & Brooks/Cole.
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  Wadsworth & Brooks/Cole.