# 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`

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])`

.

##### 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()
```

*Documentation reproduced from package stats, version 3.3, License: Part of R 3.3*

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