August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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108
｜
第
12
章
你可以随时使用
Prep Builder
中的定制过滤器设置自己的采样规则，这样你就可以
控制较小的数据集所包含的内容（见图
12-4
）。只需记住，通过自己设置，你会对
数据集产生倾向性观点，所以要谨慎对待从这种方法得出的任何数据分析结论。
图
12
-
4
：在输入步骤中设置过滤器
12.5
何时不要采样
采样可以加快数据准备过程，但如果你想把
Prep
也用于数据分析过程呢？通过概况
窗格显示值的分布并突出显示数据的记录，可以在
Prep
本身中回答你所关注的问题。
在这种情况下，你会希望避免使用数据样本，以防止被问及以下这样的问题时，出
现尴尬局面：
•
这有多少个？
•
我们第一次销售是什么时候？
•
你能确认这种情况从未发生过吗？
如果对输入数据集进行采样，就很难对这些问题给出一个有把握的答案。所以，在
这种情况下，你要简单地改变输入，使用
Prep
中的所有数据。这可能会增加处理时
间，但获得了所有数据都存在的保证。当通过输出数据来运行流程时，无论输入上
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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.