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Rで最頻値を求める

Posted at

Rにはなぜか最頻値を求める関数って無いですよね。。。

statmode.R
statmode <- function(x) {
  names(which.max(table(x)))
}
実行例
x <- c("a", "b", "b", "c", "c", "c", "d", "d", "e")
y <- c(1, 1, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 5)
z <- c(1.1, 1.1, 2.2, 2.3, 2.4, 3.1, 3.2, 3.4, 3.5, 4.8, 4.8, 4.8, 5.6, 5.6)
(mode <- statmode(x))
(mode <- statmode(y))
(mode <- statmode(z))
結果
[1] "c"
[1] "3"
[1] "4.8"

他にいいやりかたがあったら教えてください。

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