| ave | R Documentation |
Subsets of x[] are averaged, where each subset consist of those
observations with the same factor levels.
ave(x, ..., FUN = mean)
x |
A numeric. |
... |
Grouping variables, typically factors, all of the same
|
FUN |
Function to apply for each factor level combination. |
A numeric vector, say y of length length(x).
If ... is g1, g2, e.g.,
y[i] is equal to FUN(x[j], for all j with
g1[j] == g1[i] and g2[j] == g2[i]).
mean, median.
require(graphics)
ave(1:3) # no grouping -> grand mean
attach(warpbreaks)
ave(breaks, wool)
ave(breaks, tension)
ave(breaks, tension, FUN = function(x) mean(x, trim = 0.1))
plot(breaks, main =
"ave( Warpbreaks ) for wool x tension combinations")
lines(ave(breaks, wool, tension ), type = "s", col = "blue")
lines(ave(breaks, wool, tension, FUN = median), type = "s", col = "green")
legend(40, 70, c("mean", "median"), lty = 1,
col = c("blue","green"), bg = "gray90")
detach()
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