July 2018
Intermediate to advanced
596 pages
13h 35m
Japanese
Content preview from Pythonによるデータ分析入門 第2版 ―NumPy、pandasを使ったデータ処理
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14.3
アメリカの赤ちゃんに名付けられた名前リスト（
1880-2010
）
465
14.3.1.2
名前「末尾一文字」の変化
続いて、名前の末尾文字の変化に着目したいと思います。
Laura Wattenberg
はアメリカで有名な
名付け研究家です。彼女は男の子の名前の末尾の文字が過去
100
年で大幅に多様化したという事実を
2007
年に発見し、ウェブサイト（
http://www.babynamewizard.com
）で紹介しています。これを確かめ
るのに、全年度分の赤ちゃん命名データを、年度、性別、末尾の文字で集計してみたいと思います。
#
名前列から末尾文字を抽出
get_last_letter = lambda x: x[-1]
last_letters = names.name.map(get_last_letter)
last_letters.name = 'last_letter'
table = na
mes.pivot_table('births', index=last_letters,
columns=['sex', 'year'], aggfunc=sum)
末尾文字の抽出過程は次の通りです。まず無名関数（
lambda
）を使って、引数に与えられた文
字列の配列最終要素（つまり末尾文字）を返す関数を
get_last_letter
として定義しました。
次に
Series.map
により、名前の列挙（
Series
型）から、それに対応する名前末尾文字の列挙
（
Series
型）を得ます。
names ...
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