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 Northern Trust in the corp_tax tibble

result <- corp_tax  %>% 
  filter(company == "Northern Trust")

result 

# A tibble: 1 x 5
  company        profit   tax tax_rate industry 
  <chr>           <dbl> <dbl>    <dbl> <chr>    
1 Northern Trust   1076  133.    0.123 Financial

Northern Trust is in the Financialindustry. It had a profit of $ 1076million and tax of $ 132.8 million. Its tax rate was 12.3%.

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Let’s find the company in the Chemicals industry with the highest profit

result <- corp_tax %>% 
  filter(industry == 'Chemicals') %>% 
  slice_max(profit, n=1)
result

# A tibble: 1 x 5
  company          profit   tax tax_rate industry 
  <chr>             <dbl> <dbl>    <dbl> <chr>    
1 Sherwin-Williams  1307.  289.    0.221 Chemicals

Sherwin-Williams is a company in the Chemicals industry with the highest profit. It had a profit of $ 1307.278million and tax of $ 288.755 million. Its tax rate was 22.1%.