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 Sanmina-SCI in the corp_tax tibble.

result <-  corp_tax %>% 
  filter(company=="Sanmina-SCI")
result

# A tibble: 1 × 5
  company     profit    tax tax_rate industry                         
  <chr>        <dbl>  <dbl>    <dbl> <chr>                            
1 Sanmina-SCI   16.2 -0.122 -0.00754 Computers, office equip, softwar…

Sanmina-SCI is in the Computers, office equip, software, data industry. It had profit of $16.183 million and tax of $-0.122 million. Its tax rate was -0.8%.

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Let’s find the company in the Computers, office equip, software, data industry with the highest profit

result <- corp_tax %>% 
  filter(industry == "Computers, office equip, software, data") %>% 
  slice_max(profit, n=1)
result

# A tibble: 1 × 5
  company profit   tax tax_rate industry                              
  <chr>    <dbl> <dbl>    <dbl> <chr>                                 
1 Apple    24352  4125    0.169 Computers, office equip, software, da…

Apple is the company in the Computers, office equip, software, data industry with the highest profit. It had profit of $2.4352^{4} million and tax of $4125 million. Its tax rate was 16.9%.