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New Date and Time: Webinar Analyzing Demonstration Data for Redistricting now Tuesday, Aug. 10 at 3 p.m. ET
With today’s announcement that the release date for the 2020 Census Public Law 94-171 Redistricting Data will be Thursday, August 12, we have rescheduled the webinar analyzing the effect of the new confidentiality protection production settings on redistricting and Voting Rights Act use cases. The new date for the webinar is Tuesday, August 10, 3:00-4:00 p.m. ET.
The analysis allows data users to compare the effect of the production settings on previously published 2010 Census data. It updates an earlier analysis that was based on the April 2021 development version.
The protections are based on a technique known as differential privacy. As with methods we’ve used in the past, differential privacy works by adding statistical noise, or “fuzziness,” to the data. However, differential privacy ensures that the noise is added in a calibrated way. Enough noise is added to protect confidentiality, but not so much as to damage the statistical validity of our publications.
The algorithm that calibrates noise for the redistricting data (P.L. 94-171) is called the TopDown Algorithm. It was specifically tuned to meet stringent fitness-for-use accuracy targets for the redistricting and Voting Rights Act use cases.
Analysis of Demonstration Data for Redistricting and Voting Rights Act Use Cases: Production Settings
*Note: New Log-In Information
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Date: Tuesday, August 10
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Time: 3 p.m. ET
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Dial In: 1-888-323-2716
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Passcode: 6402237#
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Webex Event Number (if needed): 199 466 7251
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Link: Log in Details
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Event passcode: Analysis# (If required, this password is only for users who join from a WebEx application or mobile app.)
Visit our webinar page for past recordings and transcripts in this series.
2021 Key Dates, Redistricting (P.L. 94-171) Data Product
August 12:
- Release 2020 Census P.L. 94-171 Redistricting data in the format we’ve used in previous decades, sometimes referred to as the Legacy Format Summary File.*
- Concurrently, release Privacy-Protected Microdata Files (PPMFs) that demonstrate the impact of the production version of the Disclosure Avoidance System using 2010 Census data. These PPMFs only apply to redistricting data, not the Demographic and Housing Characteristics File (DHC) or other 2020 Census data products.
By September 30:
- Release the TopDown Algorithm production code base for P.L. 94-171 redistricting summary data file and related technical papers.
- Release 2020 Census P.L. 94-171 data in a more user-friendly format** and “Introduction to Differential Privacy” Handbook.
* Released via Census Bureau FTP site.
** Released via data.census.gov.
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