R语言中aggregate函数
1、测试数据1
name <- LETTERS[1:8] gender <- c("M","F","F","M","F","M","M","F") age <- c(30,20,40,40,30,20,30,20) height <- c(100,200,300,200,400,500,100,600) a <- data.frame(name,gender,age,height) a
2、测试2
a b <- aggregate(a[,3:4], by=list(gender=gender), FUN=mean) b
3、测试3
c <- aggregate(a[,3:4], by=list(gender=gender), FUN=sum) c
4、测试4
a d <- aggregate(a[,4], by=list(age=age),FUN=mean) d
5、测试5
a e <- aggregate(a[,4],by=list(gender=gender,age=age), FUN=mean) e f <- aggregate(a[,4],by=list(gender=gender,age=age), FUN=sum) f
