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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166
6
章 データ分布の要約
レシピ
6.12
2
次元データから密度プロットを作成する
問題
2
次元の密度データをプロットしたい。
解決策
stat_density2d()
を使用します。この関数はデータから
2
次元のカーネル密度推定を計算します。
まず、データポイントに重ねて密度曲線をプロットします（図6-34左）。
#
基本プロットを保存する
faithful_p <- ggplot(faithful, aes(x = eruptions, y = waiting))
faithful_p +
geom_point() +
stat_density2d()
..level..
を使って、密度曲線の高さを等高線の色にマッピングすることもできます（図6-34 右）。
#
密度曲線の高さを色にマッピングした等高線
faithful_p +
stat_density2d(aes(colour = ..level..))
図6-34 左：散布図と密度の等高線 右：..level..を色にマッピングしたもの
解説
2
次元のカーネル密度推定は、
stat_density()
によって計算される
1
次元の密度推定に類似したも
のですが、可視化には違った方法が必要になります。デフォルトでは等高線を使いますが、図6-35に
レシピ
6.12
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