October 2025
Intermediate to advanced
328 pages
3h 56m
Japanese
Content preview from Think Stats 第3版 ―Pythonで学ぶ統計学入門
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
2章分布
この章では、統計学の最も基本的な考え方の1つである分布を紹介します。まず度数分布表（データセット中の値とそれぞれの値の出現回数を表す表）から始め、それを使って「家族の成長に関する全国調査（NSFG）」のデータを調べます。また、外れ値と呼ばれる極端な値や誤った値を探し、その扱い方を考えます。
2.1 度数分布表
変数を表現する1つの方法として、変数の値とその度数、つまり各値が現れる回数を含む度数分布表があります。これは変数の分布と呼ばれます。
分布を表現するには、empiricaldistと呼ばれるライブラリを使います。ここでの「empirical（経験的）」とは、分布が数学的モデルではなくデータに基づいていることを意味します。empiricaldistにはFreqTabというクラスがあり、これを使って度数分布表の計算やプロットができます。これは以下のようにインポートします
from empiricaldist import FreqTab
どのように動作するかを示すために、小さな値のリストから始めることにします。
t = [1.0, 2.0, 2.0, 3.0, 5.0]
FreqTabには、from_seqメソッドがあります。このメソッドはシーケンスを受け取り、FreqTabオブジェクトを作ります。
ftab = FreqTab.from_seq(t)ftab
| 度数 | |
|---|---|
| 1.0 | 1 |
| 2.0 | 2 |
| 3.0 | 1 |
| 5.0 | 1 |
FreqTabオブジェクトはPandasのSeriesの一種で、オブジェクトとその度数を含んでいます。この例では、値1.0は度数1に対応し、値2.0は度数2に対応しています。
FreqTabには、度数分布表を棒グラフとしてプロットする ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.