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  \code{\link{xtabs}} for ways to display these data as a table.
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  \code{\link{xtabs}} for ways to display these data as a table.
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}
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}
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\examples{
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\examples{
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require(stats); require(graphics)
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require(stats); require(graphics)
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summary(warpbreaks)
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summary(warpbreaks)
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opar <- par(mfrow = c(1,2), oma = c(0, 0, 1.1, 0))
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opar <- par(mfrow = c(1, 2), oma = c(0, 0, 1.1, 0))
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plot(breaks ~ tension, data = warpbreaks, col = "lightgray",
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plot(breaks ~ tension, data = warpbreaks, col = "lightgray",
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     varwidth = TRUE, subset = wool == "A", main = "Wool A")
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     varwidth = TRUE, subset = wool == "A", main = "Wool A")
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plot(breaks ~ tension, data = warpbreaks, col = "lightgray",
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plot(breaks ~ tension, data = warpbreaks, col = "lightgray",
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     varwidth = TRUE, subset = wool == "B", main = "Wool B")
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     varwidth = TRUE, subset = wool == "B", main = "Wool B")
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mtext("warpbreaks data", side = 3, outer = TRUE)
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mtext("warpbreaks data", side = 3, outer = TRUE)