如何从数据集中获取一列，并根据另一列的最大值对其进行测试？

Question

I am currently working in the package nyclflights13, data set flights. There is a column for the name of a plane, and a column for how many times that plane flew. I want to know which plane flew the most amount of times. Also I would like to omit any missing values, ie any NA;s.

I know that I am going to have to use the summarise () function and the select function with a - to omit the missing values. I'm just not sure how to do that exactly.

Answer 1

I used this code to tally the number of rows in flights with each value of tailnum .

library(magrittr)
library(nycflights13)
data(flights)

flights %>% 
  dplyr::group_by(tailnum) %>% 
  dplyr::tally() %>% 
  dplyr::arrange(desc(n))

You can then ignore the top row when examining the results, as it is for NA values of tailnum .