Introduction to dplyr

Code and text for Quiz 3

Load the packages that we need.

library(tidyverse)
library(readxl)
library(here)

Read the data into R.

corp_tax <- read_excel(here("corp_tax.xlsx"))

Let’s look at JetBlue Airways in the corp_tax table.

result <- corp_tax %>% 
  filter(company == "JetBlue Airways")

result

# A tibble: 1 x 5
  company         profit   tax tax_rate industry      
  <chr>            <dbl> <dbl>    <dbl> <chr>         
1 JetBlue Airways    219   -60   -0.274 Transportation

JetBlue Airways is in the Transportation industry. It had a profit of $219 million and a tax of $-60 million. Its tax rate was -27.4%.

---

Let’s find the company in the Motor vehicles and parts industry with the highest profit

result <- corp_tax %>% 
  filter(industry == "Motor vehicles and parts") %>% 
  slice_max(profit, n=1)

result

# A tibble: 1 x 5
  company        profit   tax tax_rate industry                
  <chr>           <dbl> <dbl>    <dbl> <chr>                   
1 General Motors   4320  -104  -0.0241 Motor vehicles and parts

General Motors is the company in the Motor vehicles and parts industry with the highest profit. It had a profit of $4320 million and a tax of $-104 million. Its tax rate was -2.4%