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}
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}
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\seealso{
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\seealso{
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  \code{\link{apply}}, \code{\link{lapply}}, \code{\link{tapply}}.
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  \code{\link{apply}}, \code{\link{lapply}}, \code{\link{tapply}}.
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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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  \bibshow{R:Becker+Chambers+Wilks:1988}
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  \emph{The New S Language}.
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  Wadsworth & Brooks/Cole.
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}
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}
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\examples{
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\examples{
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## Compute the averages for the variables in 'state.x77', grouped
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## Compute the averages for the variables in 'state.x77', grouped
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## according to the region (Northeast, South, North Central, West) that
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## according to the region (Northeast, South, North Central, West) that
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## each state belongs to.
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## each state belongs to.