March 2022
Beginner to intermediate
360 pages
8h 6m
Japanese
Content preview from データビジュアライゼーションの基礎 ―明確で、魅力的で、説得力のあるデータの見せ方・伝え方
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217
20
章
表現の冗長化
「
19
章 色を使う際によくはまる落とし穴」で、色は期待するほど効果的に情報を伝えられない場
合があるということを学びました。識別したいアイテムがたくさんある場合、色を使って区別しようと
してもうまくいかない可能性があります。プロットの色を凡例の色と照合するのが困難だからです（図
9-1
）。 ま た 、
2
〜
3
個のアイテムを区別するだけでよい場合でも、色つきのアイテムが非常に小さかっ
た り（ 図
19-11
）、 色 覚 異 常 （
color-vision deficiency
）を持った人々が見分けにくい色を使っていたり（図
9-7
や図
9-8
）すると、色による区別はうまくいかない可能性があります。こういった状況すべてにおけ
る一般的な解決策は、色を用いて図をよりよい見栄えにしつつ、重要な情報を伝える部分は色だけに
頼らないことです。本書では、このデザインの原則を表現の冗長化と呼びます。エスセティクスの次
元を複数用いてデータの視覚表現を冗長化することを、図の作成者に促す原則だからです。
20.1
表現の冗長化を用いた凡例の設計
複数グループからなるデータの散布図を作る場合、グループごとにポイントの色だけを変えるように
設計することはよくあります。例として、図
20-1
を考えていきましょう。
3
種のアヤメ（
Iris
）の が く 片
（
sepal
）の長さと幅を示しています（がく片とは、顕花植物の花の外側についている葉です）。種ごとに
ポイントの色を変えて表示していますが、それ以外の点で
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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.