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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18
2
章 データの基本的なプロット
以 前 の バ ー ジ ョ ン の
ggplot2
で は、 棒 グ ラ フ を 作 成 す る た め に
geom_bar(stat =
"identity")
を使う方法を推奨していました。
ggplot2 2.2.0
以降では、
geom_col()
関数が
あり、これで同じことができます。
関連項目
棒グラフの作成に関するより詳しい情報については、「3章 棒グラフ」を参照してください。
レシピ
2.4
ヒストグラムを作成する
問題
1
次元のデータの分布を、ヒストグラムで表したい。
解決策
ヒストグラム（図2-8）を作成するには、
hist()
を使用し、値のベクトルを渡します。
hist(mtcars$mpg)
#
ビン
＊
1
を分割する回数は
breaks
で指定する
hist(mtcars$mpg, breaks = 10)
図2-8 左：baseグラフィックスで作成したヒストグラム
右：ビンの数を増やしたヒストグラム。ビンの幅が狭くなるにつれ、ビンごとの要素数は少なくなるこ
とに注目
ggplot2
では、
geom_histogram()
を使って同様な結果を得られます（図2-9）。
＊
1
訳注：データ範囲をいくつかの任意の区間に区切ったときの各区間をビンと呼びます。
レシピ
2.4
ヒストグラムを作成する ...
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