August 2015
Intermediate to advanced
272 pages
5h 46m
Japanese
Content preview from Think Stats 第2版 ―プログラマのための統計入門
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171
12
章
時系列分析
†
時系列（
time series
）とは、時間とともに変化するシステムの一連の測定値で
す。有名な例は、地球全体の平均温度を時間経緯で示す「ホッケースティック曲線」
（
http://en.wikipedia.org/wiki/Hockey_stick_graph
参照）
‡
です。
本章で扱う例は、米国で大麻の闇市場について研究している政治学研究者のジョー
ンズ（
Zachary M. Jones
）氏のものです（
http://zmjones.com/marijuana
）。彼は、
「草の値段（
Price of Weed
）」と呼ばれる、ウェブサイト（
http://www.priceofweed.
com/
）で、参加者に大麻の取引の値段、量、質、場所を報告するよう要請するとい
うクラウドソーシングの手法で、データを収集しています。彼のプロジェクトの目標
は、大麻合法化のような政策決定が、市場に及ぼす影響を調べることです。私にはこ
のプロジェクトが、麻薬政策のような重要な政策課題についてデータを使って取り組
んでいる例として、魅力的だと思えます。
読者の皆さんにとってもこの章が興味深いと思いますが、この機会に再度、データ
分析に対する専門家としての態度を保持することの重要性を述べておきます。どの薬
品をいつ非合法にすべきかは、重要で困難な公共政策課題です。私たちの決定は、正
直に報告された正確なデータに基づかなければなりません。
12.1
インポートとクリーニング
ジョーンズ氏のサイトからダウンロードしたデータは、本書のリポジトリにありま ...
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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.