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 Amazon in the corp_tax tibble.

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

result

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

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

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

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

# A tibble: 1 x 5
  company profit   tax tax_rate industry   
  <chr>    <dbl> <dbl>    <dbl> <chr>      
1 Anthem    4990  1128    0.226 Health care

Anthem is the company in Health Care industry with the highest profit. It had profit of $4990 million and tax of $ 1128 million. It’s tax rate was 22.6%.