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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34
3
章 棒グラフ
レシピ
3.4
色付きの棒グラフを作成する
問題
グラフの棒にさまざまな色を付けたい。
解決策
エステティック属性の
fill
に適切な変数をマッピングします。
ここでは、
uspopchange
データセットを例に使います。このデータセットには、
2000
年から
2010
年
までの、アメリカの州ごとの人口変動率のデータが収められています。人口の増加率が高い
10
州を抽
出して、パーセンテージの変動をグラフ化します。また、地域ごと（北東部、南部、中北部または西部）
に棒に色を付けましょう。
まず、上位
10
州を抽出します。
library(gcookbook) # uspopchange
データセットを使うために
gcookbook
を読み込む
library(dplyr)
upc <- uspopchange %>%
arrange(desc(Change)) %>%
slice(1:10)
upc
#> St
ate Abb Region Change
#> 1 Nevada NV West 35.1
#> 2 Arizona AZ West 24.6
#> 3 Utah UT West 23.8
#> ...<4 more rows>...
#> 8 Florida FL South 17.6
#> 9 Colorado CO West 16.9
#> 10 South Carolina SC South 15.3
これで、
Region
を
fill
にマッピングするとグラフを描画できます（図3-9）。
ggplot(upc, ...
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