September 2014
Intermediate to advanced
236 pages
4h 17m
Japanese
Content preview from Think Bayes ―プログラマのためのベイズ統計入門
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■
21
3
章
推定
3.1
サイコロ問題
4
面のサイコロ、
6
面のサイコロ、
8
面のサイコロ、
12
面のサイコロ、
20
面のサイコ
ロの入った箱を持っているとする。
Dungeons & Dragons
というゲームをしたことがあ
れば、言いたことがわかるだろう。
箱からサイコロをランダムに選んで、振って、
6
が出たとする。各サイコロを振った
確率は、どうなるか。
このような問題に取り組む
3
ステップ戦略を示そう。
1.
仮説の表現を選ぶ。
2.
データの表現を選ぶ。
3.
尤度関数を書く。
これまでの例では、文字列を使って仮説とデータを表したが、このサイコロ問題では
数を使う。具体的には、整数
4, 6, 8, 12, 20
で仮説を表す。
suite = Dice([4, 6, 8, 12, 20])
そして、
1
から
20
の整数でデータを表す。こういう表現だと、尤度関数が簡単になる。
class Dice(Suite):
def Likelihood(
self, data, hypo):
if hypo < data:
return 0
else:
return 1.0/hypo
22
■
3
章
推定
Likelihood
の処理は次のようになる。
hypo<data
なら、出た目がサイコロの面の個数
より多いことを意味する。これは
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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.