October 2021
Intermediate to advanced
289 pages
8h 31m
Chinese
Content preview from 数据科学中的实用统计学(第2版)
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探索性数据分析
｜
5
记录
表格中的一行通常称为一条记录。
同义词
事例、示例、实例、观测、模式、样本
表1-1：一个典型的数据框格式
Category Currency sellerRating Duration endDay ClosePrice OpenPrice Competitive?
Music/Movie/Game US 3249 5 Mon 0.01 0.01 0
Music/Movie/Game US 3249 5 Mon 0.01 0.01 0
Automotive US 3115 7 Tue 0.01 0.01 0
Automotive US 3115 7 Tue 0.01 0.01 0
Automotive US 3115 7 Tue 0.01 0.01 0
Automotive US 3115 7 Tue 0.01 0.0 0
Automotive US 3115 7 Tue 0.01 0.01 1
Automotive US 3115 7 Tue 0.01 0.01 1
在表
1-1
中，既有测量数据或计数数据，如持续时间（
Duration
）和价格（
Price
），也有分
类型数据，如类别（
Category
）和货币
（
Currency
）。正如前面说过的，分类变量的一种特
殊形式是二元变量（是
/
否
或
0/1
）。 表
1-1
中最后一列就是二元变量，它是一个指示变量，
表示拍卖是竞价的（有多个出价人）还是非竞价的。在预测拍卖是否竞价的情形中，这个
指示变量恰好也是一个结果变量。
1.2.1
数据框和索引 ...
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