# ave

0th

Percentile

##### 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 as x.
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]).

mean, median.
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()