August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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234
｜
第
26
章
26.3
分组技术
分组和替换值是
Tableau Prep
中最有用的功能之一，而且使用起来也非常方便。正
如本节将介绍的那样，有三种主要技术用于对值进行分组，这使得
Tableau Prep
可
以处理大量的应用场景。
26.3.1
手动分组
手动分组对于解决简单、快速的问题来说是很好的方式。然而，对于一个更大、更
复杂的困难问题，这种技术很容易变得令人沮丧。
手动分组允许你通过选择要分组的数据点，将自己的逻辑应用到数据集上（见图
26-
3
）。
图
26
-
3
：通过分组可以解决 Team（团队）匹配错误的问题
很明显，在这个例子中，我们想让第二行数据与
York
的其他实例一样。每个工具都
有自己的方法，但在
Prep Builder
中，解决方案非常简单：
1
．
使用概况窗格快速查看数据集中的异常值（见图
26-4
）。
图
26
-
4
：在概况窗格中查看异常值
｜
235
基于分组的数据清理
2
．
按住
Ctrl
键或
Mac
上的
Command
键选择要清理
/
修改的值（见图
26-5
）。
图
26
-
5
：在 Prep Builder 中选择多个值
3
．
单击右键，弹出菜单（见图
26-6
）。
图
26
-
6
：多值分组的选项菜单
4
．
选择
Group
（组）菜单来形成新的分组。需要记住，你选择的第一个数据值将
成为该组的名称。不过这很容易修改 ...
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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.