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Fixes #496

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hadley 2017-05-03 08:11:20 -05:00
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transform.Rmd
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@ -869,7 +869,7 @@ Functions that work most naturally in grouped mutates and filters are known as
### Exercises ### Exercises
1. Refer back to the table of useful mutate and filtering functions. 1. Refer back to the lists of useful mutate and filtering functions.
Describe how each operation changes when you combine it with grouping. Describe how each operation changes when you combine it with grouping.
1. Which plane (`tailnum`) has the worst on-time record? 1. Which plane (`tailnum`) has the worst on-time record?