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  A list of class \code{"by"}, giving the results for each subset.
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  A list of class \code{"by"}, giving the results for each subset.
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}
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}
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\seealso{\code{\link{tapply}}}
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\seealso{\code{\link{tapply}}}
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\examples{
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\examples{
- 
 
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require(stats)
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data(warpbreaks)
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data(warpbreaks)
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attach(warpbreaks)
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attach(warpbreaks)
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by(warpbreaks[, 1:2], tension, summary)
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by(warpbreaks[, 1:2], tension, summary)
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by(warpbreaks[, 1], list(wool=wool, tension=tension), summary)
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by(warpbreaks[, 1], list(wool=wool, tension=tension), summary)
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by(warpbreaks, tension, function(x) lm(breaks ~ wool, data=x))
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by(warpbreaks, tension, function(x) lm(breaks ~ wool, data=x))