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Cancelled flights exercise 

Fixes #117
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hadley 2016-07-22 11:16:50 -05:00
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@ -813,6 +813,9 @@ daily %>%
Which is more important: arrival delay or departure delay? Which is more important: arrival delay or departure delay?
1. Our definition of cancelled flights (`!is.na(dep_delay) & !is.na(arr_delay)`
) is slightly sup-optimal. Why? Which is the most important column?
1. Look at the number of cancelled flights per day. Is there a pattern? 1. Look at the number of cancelled flights per day. Is there a pattern?
Is the proportion of cancelled flights related to the average delay? Is the proportion of cancelled flights related to the average delay?