Data were linked using a common state level identifier when possible,
with matching on identifiers used and crosschecked
with other data as well as any estimates of overlap available in the literature.
Data cleaning was done by comprehensive review of data entry procedures and uses for each contributing agency
(Department of Health, Mental Health, Social Services, Juvenile Court, Special Education)
as well as reference to existing literature.
Social services data included addresses which were geocoded to link to tract level U.S. Census information.