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 Masco in the corp_tax tibble.

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

result

# A tibble: 1 × 5
  company profit   tax tax_rate industry               
  <chr>    <dbl> <dbl>    <dbl> <chr>                  
1 Masco     789.  127.    0.161 Metals & metal products

Masco is in the Metals & metal products. It had profit of $788 million and tax of $126 million. Its tax rate was 0.16%.

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

corp_tax  %>% 
  filter(industry == 'Health care')  %>% 
  slice_max(profit, n=1)

# 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. It had profit of $4990 million and tax of $1128 million. Its tax rate was 0.22%.