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 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 $126.358 million. Its tax rate was 13.7%.

---

Let’s find the company in the Industrial machinery industry with the highest profit.

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

# A tibble: 1 x 5
  company                 profit   tax tax_rate industry            
  <chr>                    <dbl> <dbl>    <dbl> <chr>               
1 Honeywell International   2830   -71  -0.0251 Industrial machinery

Honeywell International is the company in the Industrial machinery industry with the highest profit. It had a profit of $2830 million and tax of $-71 million. Its tax rate was -2.5%.