# Episode 12: Download Files and PUMS

Explains summary files and PUMS while protecting confidentiality and valid geography.

## Sources and attribution

- [ACS Summary File](https://www.census.gov/programs-surveys/acs/data/summary-file.html) by U.S. Census Bureau American Community Survey; published by U.S. Census Bureau.
- [Public Use Microdata Sample](https://www.census.gov/programs-surveys/acs/microdata.html) by U.S. Census Bureau American Community Survey; published by U.S. Census Bureau.
- [Open Data](https://www.census.gov/about/policies/open-gov/open-data.html) by U.S. Census Bureau; published by U.S. Census Bureau.
- [General Plan](https://www.torranceca.gov/Government/Departments-Offices/Departments-Offices/Community-Development/Planning-Division/Comprehensive-Planning/General-Plan) by City of Torrance; published by City of Torrance.

This episode is an independent study production based on the sources listed above. Source attribution does not imply affiliation, approval, sponsorship, or endorsement by any author, publisher, or institution.

## License

U.S. Government work not subject to copyright in the United States; third-party material excluded; U.S. Government work not subject to copyright in the United States; disclosure protections and data-use guidance apply; Public U.S. Census Bureau data; privacy, security, and third-party restrictions still apply; Copyrighted local government webpage; facts summarized with attribution, no expressive text reproduced

## Production notes

Independent educational production. Not an official U.S. Census Bureau or City of Torrance course, not endorsed or certified by either, and not legal or statistical advice. The narration is an original synthesis. Verify current law, guidance, course requirements, and source terms before relying on it.

Stable episode ID: `cb5f15b5-d89a-5486-b89c-30df0976f969`

## Transcript

This episode focuses on bulk and microdata access. Census data becomes useful when the population, measure, geography, and time period are stated before anyone searches for a number.

Summary files support bulk access to published aggregate estimates. They preserve table structure and geography but require careful use of lookup files, sequence layouts, annotations, and margins of error.

Public Use Microdata Sample files contain disclosure-protected person and housing-unit records for custom analysis. They are samples, require weights, and identify only selected large geographies. Public Use Microdata Areas are the most detailed geography identified.

Never infer that a PUMS record represents a named person or a specific neighborhood. Follow API and privacy terms, use replicate weights where required, and document recodes. A custom estimate needs the same uncertainty and universe checks as a published table.

Torrance application segment. This local application is separate from the Census Academy instruction. The cited City of Torrance primary source is General Plan, published at https://www.torranceca.gov/Government/Departments-Offices/Departments-Offices/Community-Development/Planning-Division/Comprehensive-Planning/General-Plan. For a local analysis, use summary tables for Torrance-specific geography and do not label PUMA microdata as city-level evidence. Do not present City policy or administrative records as Census Bureau findings, and do not present a federal estimate as adopted City policy.

Keep a reproducibility packet containing the question, source URLs, exact vintage, table or query, geography codes, raw result, calculations, and uncertainty note. This narration is an original synthesis of cited U.S. Census Bureau government works and separately cited City of Torrance material. Third-party videos, software, graphics, and linked works are excluded. This product uses Census Bureau information but is not endorsed or certified by the Census Bureau. It is not an official City product and does not imply City endorsement.