July 2014
Beginner to intermediate
456 pages
11h 26m
Japanese
Content preview from 戦略的データサイエンス入門 ―ビジネスに活かすコンセプトとテクニック
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298
10 章 テキスト表現とテキストマイニング
10.7.2
データ
今取り上げているタスクで利用するデータは、異なる
2
つの時系列から構成されていま
す。ニュース記事（テキストドキュメント）の流れと、それに応じた日々の株価の流れで
す。
Google
ファイナンスや
Yahoo!
ファイナンスなど、インターネット上には、財務データ
に関する多くのソース（情報源）があります。例えば、アップルコンピュータに関するニュー
ス記事を見たいのであれば、対応する
Yahoo!
ファイナンスのページ（
http://finance.yahoo.
com/q?s=AAPL
）を見れば良いでしょう。
Yahoo!
はロイターや
PRWeb
、フォーブスなど、
さまざまなソースからニュース記事を集めています。過去から現在に至るまでの株価の変遷
についても、
Google
ファイナンス（
https://www.google.com/finance
）など、多くのソー
スから得ることができます。
マイニング対象とするのは、ニューヨーク証券取引所と
NASDAQ
における
1999
年の上
場株式データです。このデータは先行研究［
Fawcett & Provost 1999
］でも利用されていま
す。データには主要な取引所における株式の始値と終値、それに年間を通じた金融ニュース
の一覧（全部でおよそ
36,000
の記事があります）が含まれています。それではコーパスの中
からサンプルのニュース記事を見てみましょう。
1999-03-30 14:45:00
マサチューセッツ州ウォルサム—（ビジネスワイヤ ...
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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.