Home

Welcome to the DDHC-B release wiki!

This repository contains source code for the SafeTab-H disclosure avoidance application. SafeTab-H was used by the Census Bureau for the protection of individual 2020 Census responses in the tabulation and publication of the Detailed Demographic and Housing Characteristics File A (DDHC-B).

Using the mathematical principles of formal differential privacy, SafeTab-H infuses noise into Census survey results to create privacy-protected microdata which are used by Bureau subject matter experts to create the 2020 DDHC-B product. SafeTab-H was built on Tumult Labs' "Analytics" platform and both SafeTab-H and the underlying platform are implemented in Python. The latest version of the platform can be found at https://tmlt.dev/.

In the interests of both transparency and scientific advancement, the Census Bureau committed to releasing any source code used in creation of products protected by formal privacy guarantees. In the case of the Detailed Demographic & Housing Characteristics publications, this includes code developed under contract by Tumult Labs (https://tmlt.io/) and MITRE corporation. Tumult Labs' underlying platform is evolving and the code in the repository is a snapshot of the code used for the DDHC-B.