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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146
6
章 データ分布の要約
図6-11 ヒストグラムの上に重ね書きした密度関数
関連項目
バイオリンプロットに関する詳細は「レシピ6.9 バイオリンプロットを描く」を参照してください。
バイオリンプロットは密度曲線を表すもう
1
つの方法で、複数の分布を比較するのに向いています。
レシピ
6.4
グループ化されたデータから複数の密度曲線を
作成する
問題
複数のグループ化されたデータから密度曲線を作成したい。
解決策
geom_density()
を使って、グループ化の変数を
colour
か
fill
のエステティック属性にマッピン
グします（図 6-12）。グループ化変数は、ファクタもしくは文字列ベクトルである必要があります。
birthwt
データセットでは、グループ化変数である
smoke
は数値として格納されていますので、まずこ
れをファクタに変換しなくてはいけません。
library(MASS) # birthwt
データセットを使うために
MASS
を読み込む
birthwt_mod <- birthwt %>%
mutate(smoke = as.factor(smoke)) # smoke
をファクタに変換する
# smoke
を
colour
にマッピングする
レシピ
6.4
グループ化されたデータから複数の密度曲線を作成する ...
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