Homework 4

You are currently in the GitHub repository (repo) for HW-4. You must have completed all the steps in Setting Up.

Learning Goals

• Working with choropleth maps in R
• Tackling a larger-scale more open-ended question

Homework

1. Follow the same workflow as in HW-0 for HW-4.
2. Do not submit a HW-4.Rmd file that does not knit.
3. I anticipate you spending between 8-12 total (across all submissions) on this homework.

Tips

• Use 2010 Census data; missing data should not be a problem except for Fairfax County, Virginia with FIPS Code 51059.
• One-dimensional center of mass.
• To get the centroids of all n polygons in a SpatialPolygons class object in R use sp::coordinates(), which returns a n x 2 matrix where the first column is longitude and the second is latitude. You can assume that the order of the centroids matches the order of counties_sp@data in the example below:

library(USAboundaries)
library(sp)

counties_sp <- us_counties()
centroids <- coordinates(counties_sp)
head(centroids)

##         [,1]     [,2]
## 0 -116.60176 48.29976
## 1  -85.42674 41.64232
## 2 -121.64454 45.51723
## 3  -97.69895 27.42438
## 4  -87.77990 36.03963
## 5  -97.85142 34.48557