Introduction to dplyr

Code and Test 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 NVR in the corp_tax tibble.

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

# A tibble: 1 x 5
  company profit   tax tax_rate industry                  
  <chr>    <dbl> <dbl>    <dbl> <chr>                     
1 NVR       923.  126.    0.137 Engineering & construction

NVR is in the Engineering & construction industry. It had a profit of $922.694 million and tax of $126.358million. Its tax rate was 13.7%.

Let’s find the company in the Food & beverages & tobacco industries with the highest profit.

result  <- corp_tax %>% 
  filter(industry == 'Food & beverages & tobacco') %>% 
  slice_max(profit, n=1)
result

# A tibble: 1 x 5
  company      profit   tax tax_rate industry                  
  <chr>         <dbl> <dbl>    <dbl> <chr>                     
1 Altria Group   8922  1911    0.214 Food & beverages & tobacco

Altria Group is the company in Food & beverages & tobacco industry with the highest profit. It had a profit of $8922 million and tax of $1911million. Its tax rate was 21.4%.