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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156
6
章 データ分布の要約
解説
箱ひげ図の中央にある水平線は、平均値ではなく中央値を表示しています。データの分布が正規分
布であれば中央値と平均値はほぼ同じ値になりますが、データの分布が偏っている場合には両者の値
は異なります。
レシピ
6.9
バイオリンプロットを描く
問題
異なるグループの密度推定曲線を比較するために、バイオリンプロットを作成したい。
解決策
geom_violin()
を使います（図6-22）。
library(gcookbook) # heightweight
データセットを使うために
gcookbook
を読み込む
# heightweight
データセットを使って基本プロットを作成する
hw_p <- ggplot(heightweight, aes(x = sex, y = heightIn))
hw_p +
geom_violin()
図6-22 バイオリンプロット
レシピ
6.9
バイオリンプロットを描く
157
解説
バイオリンプロットは複数のデータ分布を比較する
1
つの方法です。普通の密度曲線では、あまり多
くの分布を重ね書きすると線が重なって見づらくなります。バイオリンプロットは複数の分布を並べて
配置するため、分布の比較がしやすいプロットです。
バイオリンプロットは、カーネル密度推定を左
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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.
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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.