Attached is the American Community Survey (ACS) Research and Evaluation report, "Response Consistency between the Detailed Race and Hispanic Origin Questions from the 2016 ACS Content Test and the Ancestry Question."

As currently constructed, each individual residing in every sampled housing unit and group quarter in the ACS is asked three separate questions regarding Hispanic origin, race, and ancestry. Questions arise about the extent to which data collected in the ancestry item are distinct from data collected in the race and Hispanic origin items, particularly in light of planned updates that will ask detailed information for all race categories. Using 2016 ACS Content Test data, this research first measured the degree of similarity between individuals’ race/Hispanic origin and ancestry responses. Second, using 2016 ACS production data with 2016 ACS Content Test data, this research compared group estimates derived from race and Hispanic origin responses with estimates derived from ancestry responses.