Amounts and proportions

Due by 11:59 PM on Monday, September 18, 2023

The New York City Department of Buildings (DOB) maintains a list of construction sites that have been categorized as “essential” during the city’s shelter-in-place pandemic order. They’ve provided an interactive map here where you can see the different projects. There’s also a link there to download the complete dataset.

For this exercise, you’re going to use this data to visualize the amounts or proportions of different types of essential projects in the five boroughs of New York City (Brooklyn, Manhattan, the Bronx, Queens, and Staten Island).

You’ll be doing all your R work in R Markdown this time (and from now on). You can download a zipped file of a pre-made project here:

You don’t need to make your plots super fancy, but if you’re feeling brave, experiment with adding a labs() layer or changing fill colors with scale_fill_manual() or with viridis palettes.

And as always, if you’re struggling, please talk to me and use Slack and talk to your classmates! Don’t suffer in silence!


  1. If you’re using R on your own computer, download this file, unzip it, and double click on the file named exercise-4.Rproj:

    You’ll need to make sure you have the tidyverse package installed on your computer. If you try to load it with library(tidyverse) and R gives an error that the package is missing, use the “Packages” panel in RStudio to install it.

    (Alternatively, you can open the project named “Exercise 4” on and complete the assignment in your browser without needing to install anything. This link should take you to the project—if it doesn’t, log in and look for the project named “Exercise 4”.)

  2. Rename the R Markdown file named your-name_exercise-4.Rmd to something that matches your name and open it in RStudio.

  3. Complete the tasks given in the R Markdown file.

    Fill out code in the empty chunks provided (you can definitely copy, paste, and adapt from other code in the document or the example page—don’t try to write everything from scratch!).

    You’ll need to insert your own code chunks. Rather than typing them by hand (that’s tedious!), use the “Insert” button at the top of the editing window, or press + + I on macOS, or ctrl + alt + I on Windows.

    Remember that you can run an entire chunk by clicking on the green play arrow in the top right corner of the chunk. You can also run lines of code line-by-line if you place your cursor on some R code and press + enter (for macOS users) or ctrl + enter (for Windows users).

    Make sure you run each chunk sequentially. If you run a chunk in the middle of the document without running previous ones, it might not work, since previous chunks might do things that later chunks depend on.

  4. When you’re all done, click on the “Knit” button at the top of the editing window and create a Word or PDF version (if you’ve installed tinytex) of your document. Upload that file to iCollege. Do not upload a knitted HTML file (they don’t work on iCollege).