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\alias{is.na}
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\alias{is.na}
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\alias{is.na.data.frame}
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\alias{is.na.data.frame}
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\alias{is.na<-}
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\alias{is.na<-}
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\alias{is.na<-.default}
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\alias{is.na<-.default}
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\alias{anyNA}
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\alias{anyNA}
-
 
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\alias{anyNA.data.frame}
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\alias{anyMissing}% an alternative name (in Biobase and S+ as of ~2006)
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\alias{anyMissing}% an alternative name (in Biobase and S+ as of ~2006)
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\title{\sQuote{Not Available} / Missing Values}
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\title{\sQuote{Not Available} / Missing Values}
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\description{
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\description{
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  \code{NA} is a logical constant of length 1 which contains a missing
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  \code{NA} is a logical constant of length 1 which contains a missing
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  value indicator.  \code{NA} can be coerced to any other vector
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  value indicator.  \code{NA} can be coerced to any other vector