introduction to dplyr

Code and text for Quiz 3.

load the package 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 × 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 a tax of $126.358 million. Its tax rate was 13.7%

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Let’s find the company in the Motor vehicles and parts industry with the highest profit

result<-corp_tax %>% 
  filter(industry=='Motor vehicles and parts') %>% 
   slice_max(profit, n=1)
result

# A tibble: 1 × 5
  company        profit   tax tax_rate industry                
  <chr>           <dbl> <dbl>    <dbl> <chr>                   
1 General Motors   4320  -104  -0.0241 Motor vehicles and parts

General Motors is the company in Motor vehicles and parts industry with the highest profit. It had a profit of $4320 million and a tax of $-104 million. Its tax rate was -2.4%