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.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 has a profit of $1.0835^{4} million and tax of $-129 million. Its tax rate was -1.2%.

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 × 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 of $4990 million and tax of $1128 million. Its tax rate was 22.6%.