Eric de Place’s study on the relationship between household wealth and car ownership was very interesting, but also left me a bit curious. I pulled together a few quick maps using data for the Seattle-Tacoma-Bellevue Metropolitan Statistical Area and the Portland-Vancouver-Hillsboro Metropolitan Statistical Area. Here are the results comparing the two MSA’s. Although I didn’t do a regression model, only simple mapping by zip code, I tried to add both a metropolitan/regional and spatial element to de Place’s findings. I also wanted to see if there were any trend that jumped out at me regarding home value. Seattle-Tacoma-Bellevue Metropolitan Statistical Area has overall higher home prices then the the Portland-Vancouver-Hillsboro Metropolitan Statistical Area. And Seattle-Tacoma-Bellevue Metropolitan Statistical Area home prices stayed high in some of the densest areas of the city. And in some of these areas, car ownership was very low. At first glance, Portland seemed to some of the lower home values in the more dense zip codes. Similar to Seattle, there were zip codes that were dense, had high home values, and low car ownership. However, this was a quick mapping project, no statistical analysis was performed. Although it would be fun to dig a little deeper for more relationships.
Seattle (left) and Portland (right)