October 2017
Intermediate to advanced
480 pages
9h 49m
Japanese
Content preview from Rではじめるデータサイエンス
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
20
1
章
ggplot2
によるデータ可視化
1.7
統計変換
次に、棒グラフに着目します。棒グラフは単純に見えますが、プロットではわかりにくかったこと
が明らかになるので興味深いものです。
geom_bar()
で描かれる基本的な棒グラフを考えます。次の
図は
diamonds
データセットのダイヤモンドの総数を
cut
でグループ分けして表示します。
diamonds
データセットは
ggplot2
にあり、約 54,000個のダイヤモンドについての情報を各ダイヤモンドの
price
,
carat
,
color
,
clarity
,
cut
について含みます。グラフから高品質カットのダイヤモンドの方
が低品質のより多いことがわかります。
ggplot(data = diamonds) +
geom_bar(mapping = aes(x = cut))
グラフの
x
軸は
diamonds
の変数
cut
を表します。
y
軸は
count
（個数）ですが、これは
diamonds
の
変数ではありません。どこから来たのでしょうか。散布図のような多くのグラフは、データセットの
生のデータ値を表示しています。棒グラフのようなグラフでは新たな値を計算して表示します。
●
棒グラフ、ヒストグラム、度数分布多角形ではデータを区分けして、区分の個数を表示する。
●
データに合わせるようにスムーザがモデルを作り、モデルから予測してプロットする。
●
箱ひげ図は分布の頑健な要約であり、特別な形式の箱を表示する。
グラフのための新たな値を計算するのに使われるアル ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.