2: 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 NVR at the corp_tax tibble.

result <- corp_tax %>% 
  filter(company == 'Westrock')

result    

# A tibble: 1 x 5
  company  profit   tax tax_rate industry                   
  <chr>     <dbl> <dbl>    <dbl> <chr>                      
1 Westrock   710. -4.10 -0.00578 Miscellaneous manufacturing

NVR is in the Miscellaneous manufacturing industry. It had profit of $709.9 million and tax of $-4.1 million. Its tax rate was -0.6%.

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