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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416
15
章 データの前処理
ん。このような場合は
gather()
を使う前に
ID
変数を追加できます。
#
データのコピーを作成
co <- corneas
# ID
列の追加
co$id <- 1:nrow(co)
gather(co, "eye", "thickness", affected, notaffected)
#> id eye thickness
#> 1 1 affected 488
#> 2 2 affected 478
#> ...<12 more rows>...
#> 15 7 notaffected 464
#> 16 8 notaffected 476
ID
変 数 が 数 値 の 場 合 は 後 続 の 分 析 に 問 題 を 起 こ す か も し れ ま せ ん。 そ の 場 合 は
id
を
as.character()
で文字列ベクトルに変換したり、
factor()
でファクタに変換したい場合もあるかもし
れません。
関連項目
反対方向である縦持ち形式から横持ち形式への変換は「レシピ15.20 縦持ち形式から横持ち形式へ
変換する」を参照してください。
横持ち形式から縦持ち形式へ変換する他の方法としては
stack()
関数を参照してください。
レシピ
15.20
縦持ち形式から横持ち形式へ変換する
問題
縦持ち形式（
long format
）から横持ち形式（
wide format
）へデータを変換したい。
解決策
tidyr
パッケージの
spread()
関数を使います。この例では縦持ち形式の
plum
デー
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.