A city can be identified if and only if its boundaries line up with the PUMA boundaries (or migpuma1 boundaries if I look at the city of residence 1 year ago (MIGCITY1) ). However, some cities (e.g. Akron, OH) are identifiable when i look at the variable CITY but they disappear when I look at the city of residence 1 year ago. How is this possible?
Thank you for your time