Changed gain to be dep_delay - arr_delay, and not vice versa. (#595)
Fixes #594
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@ -325,7 +325,7 @@ flights_sml <- select(flights,
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air_time
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air_time
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)
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)
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mutate(flights_sml,
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mutate(flights_sml,
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gain = arr_delay - dep_delay,
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gain = dep_delay - arr_delay,
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speed = distance / air_time * 60
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speed = distance / air_time * 60
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)
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)
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```
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```
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@ -334,7 +334,7 @@ Note that you can refer to columns that you've just created:
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```{r}
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```{r}
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mutate(flights_sml,
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mutate(flights_sml,
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gain = arr_delay - dep_delay,
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gain = dep_delay - arr_delay,
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hours = air_time / 60,
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hours = air_time / 60,
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gain_per_hour = gain / hours
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gain_per_hour = gain / hours
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)
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)
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@ -344,7 +344,7 @@ If you only want to keep the new variables, use `transmute()`:
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```{r}
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```{r}
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transmute(flights,
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transmute(flights,
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gain = arr_delay - dep_delay,
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gain = dep_delay - arr_delay,
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hours = air_time / 60,
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hours = air_time / 60,
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gain_per_hour = gain / hours
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gain_per_hour = gain / hours
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)
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)
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