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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45
45
3.7 用語集
それでは、先ほど述べたバイアスはどこから来たのだろう
?
私が走っている問に他
のランナーを抜くあるいは他のランナーに抜かれる回数は彼我の速さの差に比例す
る。私は遅いランナーを追い抜きやすく、速いランナーに追い抜かれやすいのだ。同
じ速度のランナーは互いを見ることがほとんどないのだ。
各ランナーのスピードの実際の分布を表す
Pmf
オブジェクトと、走っている観察
者のスピードとを入力とし、走っている観察者から見たランナーのスピードの分布を
表す新しい
Pmf
オブジェクトを返す
ObservedPmf
という関数を書きなさい。
書いた関数をテストするために
relay.py
を使うことができる。これは、マサチュー
セッツ州のデダムで開かれた、ジェイムズ・ジョイス
10
キロレースの結果を読み込み、
各ランナーのペースを
mph
（毎時何マイル）に変換する。
このランナーと毎時
7.5
マイル（約
12
キロ）で走ったときに、観測する周りのラ
ンナーのスピードの分布を計算しなさい
†
。
3.7
用語集
確率質量関数（
Probability mass function
、
PMF
）
値に対して確率を返す関数として表す分布の表現。
確率（
probability
）
標本サイズの割合として表現される度数。
正規化（
normalization
）
確率を求めるために度数を標本サイズで割る処理。
インデックス（
index
）
pandas
の
DataFrame
で、行ラベルを表す特別なカラム。
†
答えは
relay_soln.py
にある。
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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.