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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7
7
1.5 変数
...
13590 3
13591 4
13592 5
Name: pregordr, Length: 13593, dtype: int64
この例では、インデックスが
0
から
13592
までの整数ですが、一般には、ソート
可能な型を使うことができます。要素もここでは整数ですが、どんな型でも大丈夫です。
最後の行には、変数名、
Series
の長さ、データ型が含まれています。
int64
は、
NumPy
での型です。このプログラムを
32
ビットコンピュータで実行すると、
int32
になります。
整数のインデックスとスライスとを使って
Series
の要素にアクセスできます。
>>> pregordr[0]
1
>>> pregordr[2:5]
2 1
3 2
4 3
Name: pregordr, dtype: int64
インデックスアクセスの結果は
int64
です。スライスの結果は別の
Series
です。
ドット表記を使って
DataFrame
のカラムにアクセスできます。
>>> pregordr = df.pregordr
この表記は、カラム名が正しい
Python
識別子のときだけ働きます。すなわち、文
字で始め空白は使えないなどの制限を満たす必要があります。
1.5
変数
NSFG
データセットで、
caseid
と
pregordr
という
2
変数がすでに登場しました。
全部で
244
の変数があります。本書では、次のような変数を使います。
caseid
回答者の整数の
ID
。
8
1 章 探索的データ解析
prglength
整数の週単位で表した妊娠期間。 ...
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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.