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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28
2 章 分布
var1 = group1.var()
var2 = group2.var()
n1, n2 = len(group1), len(group2)
pooled_var = (n1 * var1 + n2 * var2) / (n1 + n2)
d = diff / math.sqrt(pooled_var)
return d
この例では、平均の差が
0.029
標準偏差となります。これは小さな値です。参
考のために述べると、
2004
年英国での男女の身長差は
1.7
標準偏差です（
https://
en.wikipedia.org/wiki/Effect_size
参照）。
2.10
結果のレポート
第一子と第二子以降とで妊娠期間の差を（あるとすれば）記述する方法を見てきま
した。これらの結果をどのように報告するのがよいでしょうか。
答えは、質問者が誰であるかに依存します。科学者なら、どんなに小さくても、何
らかの（事実としての）効果に興味を持つでしょう。医師であれば、臨床的に意義の
ある（
clinically significant
）効果、つまり治療決定に影響するような違いだけに注目
するでしょう。妊娠している女性なら、早くまたは遅く出産する確率など、自分に関
係のある結果に興味を持つでしょう。
どのように結果を報告するかも、目的に依存します。効果の重要さを強調したいな
ら、差を強調する要約統計量を選ぶでしょう。不安になっている患者に伝えるのであ
れば、文脈に沿って理解しやすい統計量を選択するでしょう。 ...
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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.