November 2019
Intermediate to advanced
472 pages
9h 23m
Japanese
Content preview from Rグラフィックスクックブック 第2版 ―ggplot2によるグラフ作成のレシピ集
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レシピ
15.8
ファクタのレベル順を変更する
387
レシピ
15.8
ファクタのレベル順を変更する
問題
ファクタのレベル順を変更したい。
解決策
factor()
に、ファクタと変更したい順番に並べ変えたレベルを渡します。これは新しいファクタを
返すので、元の変数を変更したいときは上書きする必要があります。
#
デフォルトでは、レベルは辞書順
sizes <- factor(c("small", "large", "large", "small", "medium"))
sizes
#> [1] small large large small medium
#> Levels: large medium small
factor(sizes, levels = c("small", "medium", "large"))
#> [1] small large large small medium
#> Levels: small medium larg
e
ファクタを最初に作るときに
levels
で順序を指定することもできます。
factor(c("small", "large", "large", "small", "medium"),
levels = c("small", "medium", "large"))
解説
R
には
2
種類のファクタがあります。順序付けされたファクタと順序付けされていない普通のファク
タです（実際には順序付けされたファクタは一般的に使われていません）。どちらのファクタでも何らか
の順番でレベ ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.