Introduction to dplyr

Code and text for Quiz 3.

Load the packages that we need.


Read the data into R.

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

Let’s look at Occidental Petroleum in the corp_tax tibble.

result <- corp_tax %>% 
  filter(company=="Occidental Petroleum")

result
# A tibble: 1 x 5
  company              profit   tax tax_rate industry            
  <chr>                 <dbl> <dbl>    <dbl> <chr>               
1 Occidental Petroleum   3379   -23 -0.00681 Oil, gas & pipelines

Occidental Petroleum is in the Oil, gas & pipelines industry. It had profit of $3379 million and tax of $-23 million. It’s tax rate was -0.7%.


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 x 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 profit of $1307.278 million and tax of $288.755 million. It’s tax rate was 22.1%.