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  \code{\link{apply}},
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  \code{\link{apply}},
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  \code{\link{lapply}} with its versions
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  \code{\link{lapply}} with its versions
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  \code{\link{sapply}} and \code{\link{mapply}}.
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  \code{\link{sapply}} and \code{\link{mapply}}.
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}
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}
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\examples{
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\examples{
- 
 
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require(stats)
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groups <- as.factor(rbinom(32, n = 5, p = .4))
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groups <- as.factor(rbinom(32, n = 5, p = .4))
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tapply(groups, groups, length) #- is almost the same as
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tapply(groups, groups, length) #- is almost the same as
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table(groups)
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table(groups)
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data(warpbreaks)
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data(warpbreaks)