Introduction to dplyr

Code and text for Quiz 3.

Load the packages that we need

library(tidyverse)
library(readxl)
library(here)

Read data into R.

corp_tax <- read_excel(here("corp_tax.xlsx"))

Let’s look at Occidental Petroleum

result <- corp_tax%>%
  filter(company == "Occidental Petroleum")

result

# A tibble: 1 x 5
  company              profit   tax tax_rate industry            
  <chr>                 <dbl> <dbl>    <dbl> <chr>               
1 Occidental Petroleum   3379   -23 -0.00681 Oil, gas & pipelines

Occidental Petroleum is in the Oil, gas & pipelines industry. It had profit of $ 3379 million and tax of $ -23 million. Its tax rate was -0.7 %.

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Let’s find the company in the Utilities, gas and electric industry with the highest profit

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

# A tibble: 1 x 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 profit of $ 4320 million and tax of $ -104 million. Its tax rate was -2.4 %.