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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■
129
7
章
ケーススタディ：
Twitter
アーカイブの比較
Twitter
を通じてオンラインで共有されるテキストは、多くの人々の注目を集め
ているテキストタイプの
1
つです。実際、本書で（そして広く一般に）使われている
センチメント辞書のいくつかは、もともとツイートの分析用に作られ、ツイートで
チェックされています。本書の著者は
2
人とも
Twitter
アカウントを持ち、かなり
頻繁に使っています。そこで、このケーススタディでは、ジュリア（
https://twitter.
com/juliasilge
）とデビッド（
https://twitter.com/drob
）の
Twitter
アーカイブ全体を比
較してみることにします。
7.1
データの取得とツイートの時間的分布
Twitter
ユ ー ザ は、
Twitter
の
Web
サ イ ト の 指 示（
https://support.twitter.com/
articles/2017
0160
）に従って、自分自身の
Twitter
アーカイブをダウンロードできま
す。私たちはそれぞれ自分のアーカイブをダウンロードしており、これからその特
徴を広く世間に公開したいと思っています。まず、
lubridate
パッケージを使って文
字列のタイムスタンプを
date-time
オブジェクトに変換し、全体的なツイートパター
ンを調べてみましょう（図7-1）。
library(lubridate)
library(ggplot2)
library(dplyr)
library(readr) ...
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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.