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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22
2 章 分布
図
2-3
は妊娠終了時の母親の年齢、
agepreg
のヒストグラムを示します。最頻値は
21
歳です。分布はほぼ釣り鐘型ですが、この場合には、裾が左よりも右の方に延び
ています。ほとんどの母親は
20
代で、
30
代は少なくなります。
図
2-4
週での妊娠期間のヒストグラム
図
2-4
は妊娠期間を週で数えた、
prglngth
のヒストグラムを示します。最頻値は
39
週です。左の裾のほうが右より長くなっています。早産の方が多く、
43
週を超え
ることは稀で、その場合には医者が介入することが多いのです。
2.5
外れ値
ヒストグラムを見れば、最頻値や分布の形状はたやすくわかります。しかし、稀な
値は常に見えているとは限りません。
先に進む前に、外れ値（
outlier
）がないかどうかを確認しましょう。外れ値とは、
極端な値で、測定時や記録時のエラーで生じるものか、あるいは稀な事象による正し
いデータである場合があります。
Hist
には
Largest
と
Smallest
というメソッドがあり、整数
n
を取って、ヒストグ
ラムの中で
n
番目までの大きいまたは小さい値を返します。
週
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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.