You can use fBasics package
sample(c("A","B","C"),size=20,replace = T) -> type
rnorm(20) -> value
data.frame(ty=type,val=value) -> test
require(fBasics)
nam <- rownames(basicStats(test$val))
result <- do.call("cbind", with(test, tapply(val, ty, basicStats)))
rownames(result) <- nam
result
Bests.
-----
..ooo0
...................................................................................................
..(....)... 0ooo... Walmes Zeviani
...\..(.....(.....)... Master in Statistics and Agricultural
Experimentation
....\_)..... )../.... walmeszevi...@hotmail.com, Lavras - MG, Brasil
............
(_/............................................................................................
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