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2. Use R software flight data, follow below to install, then answer questions a library(dplyr) install.packages(nycflights13) library(nycflights13) a. Find the top 3 destinations (dest) for each origin (origin).

math   Statistics-And-Probability   
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Answer #1

library(dplyr)
library(nycflights13)
data("flights")
flights

flights %>% group_by(origin,dest) %>% summarize(count=n()) %>% top_n(3)
  

the results are

flights %>% group_by(origin,dest) %>% summarize(count=n()) %>% top_n(3)
Selecting by count
# A tibble: 9 x 3
# Groups: origin [3]
origin dest count
<chr> <chr> <int>
1 EWR BOS 5327
2 EWR ORD 6100
3 EWR SFO 5127
4 JFK BOS 5898
5 JFK LAX 11262
6 JFK SFO 8204
7 LGA ATL 10263
8 LGA CLT 6168
9 LGA ORD 8857

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