1
00:00:00,740 --> 00:00:02,990
あるバスケットボールチームの統計家が

2
00:00:02,990 --> 00:00:04,800
ある 1 回の試合における

3
00:00:04,800 --> 00:00:07,600
チームの12 人の選手の得点の統計を取りました

4
00:00:07,600 --> 00:00:12,010
そして，調べたデータを幹葉表示（みきはひょうじ）で表しました

5
00:00:12,010 --> 00:00:14,040
または，かんようひょうじ，と呼ばれることもあります

6
00:00:14,040 --> 00:00:16,102
さて，このチームは，どれだけ得点したでしょうか？

7
00:00:16,102 --> 00:00:18,310
もしこの図を見るのが初めてだとしたら

8
00:00:18,310 --> 00:00:19,950
ちょっと理解するのが難しいかもしれません

9
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幹とされる欄に 0 1 2
とあって

10
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こちらには様々な数字が並んでいます

11
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この表は，チームのそれぞれの選手の得点と

12
00:00:26,190 --> 00:00:29,260
どのように関係しているのでしょうか

13
00:00:29,260 --> 00:00:31,750
幹葉表示の読み方はですね，

14
00:00:31,750 --> 00:00:33,910
葉は，
--少なくともこの統計家が用いた表示方法によれば--

15
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葉は，それぞれの選手の得点の
最も低い位の数，

16
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または，一の位の数を表しています

17
00:00:41,400 --> 00:00:42,860


18
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そして，幹は，
十の位の数を示しています

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慣習では，葉が最も低い位の数，または，一の位の数を

20
00:00:48,870 --> 00:00:50,700
そして，幹は，

21
00:00:50,700 --> 00:00:52,840
それ以外の桁を表します

22
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そして，この表の便利なところは，

23
00:00:54,480 --> 00:00:57,070
得点数に応じた選手の分布を可視化していることです

24
00:00:57,070 --> 00:00:59,310
多くの選手の得点の十の位が 0 で，つまり

25
00:00:59,310 --> 00:01:01,440
得点が一桁であったことが一目でわかります

26
00:01:01,440 --> 00:01:04,209
そして，十の位が 1 
つまり 10 点台の選手，

27
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そして，十の位が 2 
つまり 20 点台の得点をした選手は一人だけだった

28
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ということが読み取れます

29
00:01:09,450 --> 00:01:11,977
では，これらのデータを，
私たちが見慣れているやり方で

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表示してみようと思います

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