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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51
51
4.4 CDF の表現
図
4-2
CDF
の例
4.4
CDF
の表現
CDF
を表す
Cdf
という名のクラスを
thinkstats2
は提供します。
Cdf
が提供する
基本メソッドは次になります。
Prob(x)
値
x
を受け取り、確率
p
＝
CDF(x)
を計算します。ブラケット（
[]
）演算子は
Prob
に等価です。
Value(p)
確率
p
を受け取り、対応する値
x
を計算します。すなわち、
p
の逆
CDF
（
inverse
CDF
）です。
Cdf
コンストラクタは、引数として、値のリスト、
pandas
の
Series
、
Hist
、
Pmf
、
他の
Cdf
を受け取ります。次のコードは、
NSFG
の妊娠期間の分布の
Cdf
を作ります。
live, firsts, others = first.MakeFrames()
cdf = thinkstats2.Cdf(live.prglngth, label='prglngth')
52
4 章 累積分布関数
thinkplot
は、
Cdf
を線でプロットする
Cdf
という名の関数を提供します。
thinkplot.Cdf(cdf)
thinkplot.Show(xlabel='weeks', ylabel='CDF')
図
4-3
が結果を示します。
CDF
の
1
つの読み方はパーセンタイル値を見つける、
というものです。例えば ...
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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.