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"))

Lets look at Amazon.com in the corp_tax tibble.

result <- corp_tax %>% 
  filter(company == 'Amazon.com')

result

# A tibble: 1 × 5
  company    profit   tax tax_rate industry                
  <chr>       <dbl> <dbl>    <dbl> <chr>                   
1 Amazon.com  10835  -129  -0.0119 Retail & wholesale trade

Amazon.com is in the Retail & wholesale trade industry. It had a profit of $ 1.0835^{4} million and tax of $ -129 million. Its tax rate was -1.2 %.

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Let’s find the company in the Chemicals industry with the highest profit.

result <- corp_tax %>% 
  filter(industry == "Chemicals") %>% 
  slice_max(profit, n=1)
result

# A tibble: 1 × 5
  company          profit   tax tax_rate industry 
  <chr>             <dbl> <dbl>    <dbl> <chr>    
1 Sherwin-Williams  1307.  289.    0.221 Chemicals

Sherwin-Williams is the company in the Chemicals industry with the highest profit. It had a profit of $ 1307.278 million and tax of $ 288.755 million. Its tax rate was 22.1 %.