differential privacy

First 2020 Census Data Released; 7 Congressional Seats Change Hands

On April 26, the Census Bureau released the first data from the 2020 Census, including each state’s apportionment population counts (used to allocate seats to the U.S. House of Representatives and electoral college votes), resident population accounts, and overseas population counts. The release of the Constitutionally-required information was delayed due to the operational challenges of the COVID-19 pandemic and the additional time needed to correct duplicate and incomplete responses. Overall, seven Congressional seats will shift as a result of the 2020 Census. California, Illinois, Michigan, New York, Ohio, Pennsylvania, and West Virginia will each lose one Congressional seat, while Colorado,…

Census Releases Updated Demonstration Data Products

The Census Bureau has released a new set of demonstration data products that show how its new disclosure avoidance strategy (DAS) will impact the quality of its 2020 Census data products (see previous coverage). The Census Bureau is releasing a set of benchmark metrics to track the impact of the ongoing development and improvements to its privacy-protecting algorithm on data accuracy. These metrics will be updated every six weeks so data users can track the ongoing improvements Bureau staff are making to the algorithm. In addition, the Census Bureau has released a set of privacy-protected microdata files (PPMF) to allow…

Census Bureau Releases Update on 2020 Census Disclosure Avoidance Strategy

On March 13, John Abowd, the Census Bureau’s Chief Scientist, and Victoria Velkoff, the Bureau’s Associate Director for Demographic Programs, published a blog post to give a status update on the Census Bureau’s strategy for avoiding disclosure of personal information as a result of data released from the 2020 Census. The Bureau had previously announced that it planned to implement the move to a standard called “differential privacy” (which uses an algorithm to injects precise amounts of random noise into data until it reaches a desired threshold of obfuscation). It released demonstration data products to give users a chance to…

Census Bureau Releases “Demonstration” Decennial Data Products, Working with National Academies to Collect Public Input

On October 29, the Census Bureau released a set of demonstration data products that show how the privacy measures planned for 2020 Census data would have applied to data from the 2010 Census. In a blog post, Census Bureau Chief Scientist John Abowd and Associate Director for Demographic Programs Victoria Velkoff assert that the “methods we used to protect the 2010 Census and earlier statistics can no longer adequately defend against today’s privacy threats.” They describe the new disclosure avoidance techniques planned to protect 2020 Census data and invite researchers and data users to experiment with the new demonstration products…


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