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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90
6 章 確率密度関数
除くと解釈が困難です。標本歪度はさらに頑健ではありません。すなわち、外れ値の
影響でおかしくなります。結果として、歪んだ分布については、それが最も関連する
にもかかわらず、歪度について信頼が置けなくなります。
ピアソンの中央値歪度は計算した平均と分散に基づくので、外れ値に影響を受け易
いのですが、
3
次モーメントに依存しないので、多少は頑健です。
6.9
演習問題
†
演習問題
6-1
収入の分布は右に歪んでいることで有名だ。この演習問題では、その歪みがどの程
度に大きいか測る。
人口動態調査（
Current Population Survey
、
CPS
）は、米国労働統計局と国勢調
査局とが協働して収入と関連する変数を調査しているものである。
2013
年にまとめ
られたデータは
http://www.census.gov/hhes/www/cpstables/032013/hhinc/toc.
htm
から得られる。
hinc06.xls
にダウンロードしてあるが、これは、家計収入につい
ての
Excel
のスプレッドシートで、本書のリポジトリにある
CSV
ファイル
hinc06.
csv
に変換してある。このファイルを読み込んでデータを変換する
hinc2.py
もある。
データセットは、収入の範囲と各範囲に該当する回答者数の列の形式だ。家計年収
の最低範囲は、「
5,000
ドルに届かない」人々、最高範囲は、「
250,000
ドルかそれ以上」
の回答者だ。
このデータから平均や他の統計量を推定するために、下限と上限、各範囲ごとの値 ...
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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.