Nerdwallet.com Mixes Apples and Oranges on "Worst Cities for Drivers"

The website nerdwallet.com mixes apples and oranges in producing a list of the 10 worst "cities" for car drivers in the United States. The ratings hardly matter, since the nerdwallet.com score is based on a mixture of urban area and municipality data.

The Apples: Nerdrwallet.com uses the Texas Transportation Institute traveled the may delay measures for urban areas. These are areas of continuous urban development that always include far more population than is in the central city or municipality. There is no data for the traffic congestion measures at the central city level. These traffic congestion scores are nerdwallet.com's "apples."

The Oranges: The oranges of the population densities for the core municipalities. For example, the density shown for New York is that of the city, at 27,000 per square mile. The urban area has a density of approximately 5000 per square mile.

The Comparison: The net effect is that nerdwallet.com uses the city of New York, with its 8 million people in approximately 300 square miles to the New York urban area with approximately 18 million people in 3,400 square miles. These are not the same things and any score derived from the mixing of these two definitions is inherently invalid.

This is one of all too many examples of comparisons that are made in the press between "cities," with editors and fact checkers taking insufficient care to ensure that they are using comparable data.