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Tweak transform introduction

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Hadley Wickham 2022-11-07 16:41:23 -06:00
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@ -44,7 +44,8 @@ You can read these chapters as you need them; they're designed to be largely sta
- @sec-dates-and-times will give you the key tools for working with dates and date-times.
Unfortunately, the more you learn about date-times, the more complicated they seem to get, but with the help of the lubridate package, you'll learn to how to overcome the most common challenges.
- We've discussed missing values a couple of times in isolation, but @sec-missing-values will cover them holistically, helping you come to grips with the difference between implicit and explicit missing values, and how and why you might convert between them.
- @sec-missing-values discusses missing values in depth.
We've discussed them a couple of times in isolation, but now it's time to discuss them holistically, helping you come to grips with the difference between implicit and explicit missing values, and how and why you might convert between them.
- @sec-joins finishes up this part of the book by giving you tools to join two (or more) data frames together.
Learning about joins will force you to grapple with the idea of keys, and think about how you identify each row in a dataset.