ave {stats} | 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
length as x . |
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])
.
ave(1:3)# no grouping -> grand mean attach(warpbreaks) ave(breaks, wool) ave(breaks, tension) ave(breaks, tension, FUN = function(x)mean(x, trim=.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()