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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303
13
章
さまざまなグラフ
データの可視化には非常に多くの方法があり、中にはカテゴリにうまく整理できないものもあります。
この章では、そういったデータ可視化のさまざまな方法を紹介します。
レシピ
13.1
相関行列の図を作成する
問題
相関行列をグラフで表示したい。
解決策
mtcars
データセットを見てみましょう。
mtcars
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> Mazda RX4 21.0 6 160 110 3.90 2.620 16.46 0 1 4 4
#> Mazda RX4 Wag 21.0 6 160 110 3.90 2.875 17.02 0 1 4 4
#> Datsun 710 22.8 4 108 93 3.85 2.3
20 18.61 1 1 4 1
#> ...<26 more rows>...
#> Ferrari Dino 19.7 6 145 175 3.62 2.770 15.50 0 1 5 6
#> Maserati Bora 15.0 8 301 335 3.54 3.570 14.60 0 1 5 8
#> Volvo 142E 21.4 4 121 109 4.11 2.780 18.60 1 1 4 2
はじめに、
cor
を使用して数値の相関行列を作成します。この関数は、各列のペアに対して相関係数
を計算します。
mcor <- cor(mtcars)
# mcor
を
2
桁に丸めて表示
round(mcor, ...
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