This is measuring domestic migration, New York City's growth is primarily international migration. Here's an article from the same guys explaining the differen

This is measuring domestic migration, New York City's growth is primarily international migration. Here's an article from the same guys explaining the difference: http://www.citylab.com/politics/2014/04/2-very-different-migrations-driving-growth-us-cities/8873/ http://www.citylab.com/politics/2014/04/2-very-different-mig...