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  sum, and in that case the result will be \code{NA} (with a warning)
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  sum, and in that case the result will be \code{NA} (with a warning)
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  if integer overflow occurs.
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  if integer overflow occurs.
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  NB: the sum of an empty set is zero, by definition.
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  NB: the sum of an empty set is zero, by definition.
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}
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}
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\details{
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  This is a generic function: methods can be defined for it
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  directly or via the \code{\link{Summary}} group generic.
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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.
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}
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}