ave
Group Averages Over Level Combinations of Factors
Subsets of x[]
are averaged, where each subset consist of those
observations with the same factor levels.
 Keywords
 univar
Usage
ave(x, ..., FUN = mean)
Arguments
 x
 A numeric.
 ...
 Grouping variables, typically factors, all of the same
length
asx
.  FUN
 Function to apply for each factor level combination.
Value

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])
.
See Also
Examples
library(stats)
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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