May 2018
Intermediate to advanced
228 pages
4h 11m
Japanese
Content preview from Rによるテキストマイニング ―tidytextを活用したデータ分析と可視化の基礎
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1.5
単語の出現頻度
■
9
austen_books()
関数では、最初から分析したいテキストが得られましたが、ヘッ
ダーの著作権情報や書式設定を取り除くなどのクリーニングが必要な場合もありま
す。ケーススタディの章、特に「9.1 前処理」では、この種の前処理の例も紹介し
ます。
1.4
gutenbergr
パッケージ
テキストを整理する方法を説明するために
janeaustenr
パッケージを使ったので、
併 せ て
gutenbergr
パ ッ ケ ー ジ（
Robinson 2016
、
https://github.com/ropenscilabs/
gutenbergr
）も紹介しておきましょう。
gutenbergr
パッケージを使うと、
Project
Gutenberg
コレクション（
https://www.gutenberg.org/
）のパブリックドメイン作品
にアクセスすることができます。このパッケージには、本をダウン
ロードする（こ
のときに邪魔なヘッダーやフッターを取り除きます）ためのツールと、作品にアク
セスする際に使える
Project Gutenberg
メタデータの完全なデータセットが含まれ
ています。本書では、
ID
を指定して
Project Gutenberg
の作品をダウンロードする
gutenberg_download()
関数を使いますが、メタデータについて調べたり、
ID
とタイ
トル、作者、言語などを突き合わせたり、作者についての情報を集めたりすること
ができる関数もあります。
gutenbergr ...
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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.