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Update datetimes.Rmd (#265) 

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S'busiso Mkhondwane 2016-08-15 14:32:53 +02:00 committed by Hadley Wickham
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@ -149,7 +149,7 @@ Note the two tricks I needed to create these plots:
means 1 day.
1. R doesn't like to compare date-times with dates, so you can force
`ymd()` to geneate a date-time by supplying a `tz` argument.
`ymd()` to generate a date-time by supplying a `tz` argument.
### From other types
@ -322,7 +322,7 @@ Setting larger components of a date to a constant is a powerful technique that a
1. What makes the distribution of `diamonds$carat` and
`flights$sched_dep_time` similar?
1. Confirm my hypthosis that the early departures of flights in minutes
1. Confirm my hypothesis that the early departures of flights in minutes
20-30 and 50-60 are caused by scheduled flights that leave early.
Hint: create a binary variable that tells you whether or not a flight
was delayed.