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  1. Aug 2019
  2. jrnold.github.io jrnold.github.io
    5 Data transformation | R for Data Science: Exercise Solutions
    1
    1. twarczak 26 Aug 2019
      Okay, I’m not sure what’s going on in this data.

      Looks like a New York issue.

      > filter(flights, !is.na(dep_delay), is.na(arr_delay)) %>%
+   count(origin)
# A tibble: 3 x 2
  origin     n
  <chr>  <int>
1 EWR      469
2 JFK      337
3 LGA      369
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    jrnold.github.io/r4ds-exercise-solutions/transform.html