  In "The 2020 Census Disclosure Avoidance System TopDown Algorithm," Abowd et
al. (2022) describe the concepts and methods used by the Disclosure Avoidance
System (DAS) to produce formally private output in support of the 2020 Census
data product releases, with a particular focus on the DAS implementation that
was used to create the 2020 Census Redistricting Data (P.L. 94-171) Summary
File. In this paper we describe the updates to the DAS that were required to
release the Demographic and Housing Characteristics (DHC) File, which provides
more granular tables than other data products, such as the Redistricting Data
Summary File. We also describe the final configuration parameters used for the
production DHC DAS implementation, as well as subsequent experimental data
products to facilitate development of tools that provide confidence intervals
for confidential 2020 Census tabulations.
