This article explores new methods for gathering and analyzing spatially rich demographic data using mobile phones. It describes a pilot study (the Human Mobility Project) in which volunteers around the world were successfully recruited to share GPS and cellular tower information on their...

This study investigates the extent to which older (age 60 and over) and younger (age 20–34) Americans live in the same neighborhoods. It documents residential segregation by age in 1990, 2000, and 2010 at multiple scales and examines how degrees of age segregation vary across geographic space....

Most existing models of ecological inference are based on the assumption that there is no aggregation bias. Few studies have focused on how to correct/ model aggregation bias. This article takes advantage of a unique opportunity to compare the controversial ecological inference methods by using...