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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4
1 章 探索的データ解析
査母集団は、米国の
15
〜
44
歳です。理想的には、調査は母集団の全員からデー
タを回収しますが、これはほとんど不可能です。その代わりに、標本（
sample
）
と呼ぶ母集団の部分集合からデータを集めます。調査に参加する人たちは回答者
（
respondents
）と呼ばれます。
一般的に横断的調査は代表的（
representative
）であるべきです。つまり、母集団
のどのメンバーも調査対象となる機会が均等であるという意味です。この理想は、現
実に達成することが難しいのですが、調査を実施する人々は可能な限りこの条件を満
たそうとします。
NSFG
は代表的ではありません。そうではなくて、意図的にオーバーサンプリン
グ（
oversampling
）しています。この調査を設計した人たちは、ラテンアメリカ系
アメリカ人（ヒスパニック）、アフリカ系アメリカ人、
10
代の若者たち、という
3
集
団を米国の人口に占める割合より多く採用しています。オーバーサンプリングの理由
は、これらの集団の回答者数を、統計上有効な推計を導き出せるだけの十分な人数に
するためです。
もちろん、オーバーサンプリングには欠点もあります。該当調査の統計に基づく一
般母集団についての結論は容易には導き出せません。この点については、後ほど考察
します。
この種のデータを扱うときには、コードブック（
codebook
）をよく読んでおくこ
とが重要です。これは、調査設計、調査質問、回答の符号化を記述した文書です。
NSFG
データのコードブックと利用者の手引は ...
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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.