Unlike previous years, the 2011-2015 ACS Survey base data file has resulted in numerous data changes.
This updated file has resulted in 20,843 changed tracts. There are now 22,671 LMI tracts as opposed to 21,760.
WHAT THIS MEANS
Most of the HMDA/CRA/Redlining analysis on 2017 data using the previous preliminary file could have significant changes.
WHAT TO DO NOW
Geocode your files again and run reports and/or analysis (ASAP!) to find any discrepancies with the updated 2017 census file.