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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196
13 章 生存分析
も急峻になりますが、それが最も普通の妊娠期間です。
13.2
ハザード関数
生存関数からハザード関数（
hazard function
）
†
が導かれます。妊娠期間については、
ハザード関数が時間
t
に対して、
t
まで妊娠が続いたが
t
で終わってしまった割合を
対応させます。詳しくは次の数式で表されます。
λ
(t)
＝
S(t)
−
S(t
＋
1)
S(t)
分子が
t
で終わった生存期間の割合で、
PMF(t)
でもあります。
SurvivalFunction
には、ハザード関数を計算する
MakeHazard
があります。
# class SurvivalFunction
def MakeHazard(self, label=''):
ss = self.ss
lams = {}
for i, t in enumerate(self.ts[:-1]):
hazard = (ss[i] - ss[i+1]) / ss[i]
lams[t] = hazard
return HazardFunction(lams, label=label)
HazardFunction
は、
pandas
の
Series
のラッパーです。
class HazardFunction(object):
def __init__(self, d, label= ''):
self.series = pandas.Series(d)
self.label = label
d
はディクショナリなど、他の
Series
を含めて
Series
を初期化できる型であれば ...
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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.
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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.