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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388
15
章 データの前処理
ファクタを並び替える
tidyverse
の関数は
forcats
パッケージの
fct_relevel()
です。構文は
base
パッ
ケージの
factor()
関数と似ています。
#
レベル順を変更する
library(forcats)
fct_relevel(sizes, "small", "medium", "large")
#> [1] small large large small medium
#> Levels: small medium large
関連項目
別変数の値に基づいてファクタを並び替えるには「レシピ15.8 ファクタのレベル順を変更する」を
参照してください。
ファクタレベルの並び替えは軸や凡例の順序を変更する際に使えます。より詳しくは「レシピ8.4
カテゴリカルな軸の要素の順番を変更する」と「レシピ10.3 凡例の項目順を変える」を参照してくださ
い。
レシピ
15.9
データの値に基づいてファクタのレベル順を
変更する
問題
データの値に基づいてファクタのレベル順を変更したい。
解決策
reorder()
関数に、並び替えるレベルを持つファクタ、並び替えの基にする値、値を集約する関数
を渡します。
#
変更するために、
InsectSprays
データセットをコピーする
iss <- InsectSprays
iss$spray
#> [1] A A A A A A A A A A A A B B B B B B B B B B B B C C C C C C C C C C C ...
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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.