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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59
4
章
折れ線グラフ
折れ線グラフは、一般的に
y
軸上の連続値変数が
x
軸上のもう
1
つの連続値変数に対してどのように
変化するかを視覚化するために使われます。変数
x
は時間を示す場合が多いですが、実験において投
与された薬の量といったような、他の連続値変数を示す場合もあります。
棒グラフと同様に、例外も存在します。折れ線グラフは、
x
軸に離散値変数を取って使われる場合も
あります。ただし、離散値変数が正しく順序付けされている場合には折れ線グラフでの表現は適切で
すが（例えば
"S"
、
"M"
、
"L"
など）、変数が順序付けられていない場合は折れ線グラフでは表現できま
せん（例えば
"
牛
"
、
"
ガチョウ
"
、
"
豚
"
など）。この章のほとんどの例では
x
の変数に連続値変数を使っ
ていますが、変数をファクタに変換し、離散値変数として扱う場合の例も紹介します。
レシピ
4.1
基本的な折れ線グラフを作成する
問題
基本的な折れ線グラフを作成したい。
解決策
ggplot()
と
geom_line()
を使い、
x
と
y
にマッピングする変数を指定します（図4-1）。
ggplot(BOD, aes(x = Time, y = demand)) +
geom_line()
60
4
章 折れ線グラフ
図4-1 基本的な折れ線グラフ
解説
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.