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 in the corp_tax tibble

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

result

# A tibble: 1 × 5
  company profit   tax tax_rate industry                  
  <chr>    <dbl> <dbl>    <dbl> <chr>                     
1 NVR       923.  126.    0.137 Engineering & construction

NVR is in the Engineering & construction industry. It had profit of $922.694 million and tax of $126.358 million. Its tax rate was 13.7%.

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Let’s find the company in the Computers, office equip, software, data industry with the highest profit

result <- corp_tax %>% 
  filter(industry == 'Computers, office equip, software, data') %>% 
  slice_max(profit, n=1)
result

# A tibble: 1 × 5
  company profit   tax tax_rate industry                              
  <chr>    <dbl> <dbl>    <dbl> <chr>                                 
1 Apple    24352  4125    0.169 Computers, office equip, software, da…

Apple is the company in the Computers, office equip, software, data industry with the highest profit. It had profit of $2.4352^{4} million and tax of $4125 million. Its tax rate was 16.9%.