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.
353
20
章
purrr
と
broom
による
多数のモデル
20.1
はじめに
本章では膨大な数のモデルを楽に処理するのに役立つ3つの強力なアイデアを学びます。
●
複雑なデータセットを理解するために多数の単純モデルを使う。
●
データフレームで任意のデータ構造を格納するためにリスト列を使う。例えば、線形モデルを含
む列を作ることができる。
●
モデルを整理データにするために、David Robinson による
broom
パッケージを使う。整理デー
タさえあれば、本書でこれまで学んだすべての技法が使えるので、多数のモデルを処理できる
強力な技法となる。
学習内容の背景を理解できるように世界中の平均余命についてのデータを使います。小さなデー
タセットですが、可視化を改善するのにモデル化がどれほど重要かが良くわかります。多数の単純
なモデルを使って最強力信号を分割して取り除き、残っている弱い信号を調べることができます。外
れ値
や異常な傾向を取り除くのに、モデル要約がどのように役立つかも学びます。
次節以降では、次のように個別技法の詳細を学びます。
●
「20.2 gapminder」では、リスト列を使って国別のモデルを背景経済データに適合させるという
例を学ぶ。
●
「20.3 リスト列」では、リスト列データ構造をさらに学び、データフレームにリストを置くのが
なぜ妥当なのかを理解する。
●
「20.4 リスト列を作る」では、リスト列を作る3通りの方法を学ぶ。
●
「20.5 リスト列を単純化」では、もっと簡単に処理で ...
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.