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  \emph{Programming with Data. A Guide to the S Language}.
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  \emph{Programming with Data. A Guide to the S Language}.
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  Springer.
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  Springer.
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}
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}
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\seealso{
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\seealso{
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  \code{\link{NaN}}, \code{\link{is.nan}}, etc.,
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  \code{\link{NaN}}, \code{\link{is.nan}}, etc.,
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  and the utility function \code{\link{complete.cases}}.
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  and the utility function \code{\link[stats]{complete.cases}}.
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  \code{\link{na.action}}, \code{\link{na.omit}}, \code{\link{na.fail}}
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  \code{\link[stats]{na.action}}, \code{\link[stats]{na.omit}},
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  \code{\link[stats]{na.fail}}
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  on how methods can be tuned to deal with missing values.
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  on how methods can be tuned to deal with missing values.
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}
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}
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\examples{
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\examples{
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is.na(c(1, NA))        #> FALSE  TRUE
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is.na(c(1, NA))        #> FALSE  TRUE
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is.na(paste(c(1, NA))) #> FALSE FALSE
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is.na(paste(c(1, NA))) #> FALSE FALSE