# Episode 2: The ACS Is a Survey

Explains ACS period estimates, samples, topics, and appropriate interpretation.

## Sources and attribution

- [Discovering the American Community Survey](https://www.census.gov/data/academy/courses/discovering-the-american-community-survey.html) by Vicki Mack and U.S. Census Bureau; published by U.S. Census Bureau Census Academy.
- [Understanding and Using American Community Survey Data: What All Data Users Need to Know](https://www.census.gov/content/dam/Census/library/publications/2020/acs/acs_general_handbook_2020.pdf) by U.S. Census Bureau; published by U.S. Census Bureau.
- [About Torrance](https://www.torranceca.gov/Government/About-Torrance) 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; 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: `1968dd99-86ec-5c9d-8ec6-a225ca5c19c2`

## Transcript

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

The American Community Survey is a continuous sample survey, not a complete annual count. It produces period estimates about social, economic, housing, and demographic characteristics. The estimate describes data collected across the stated period.

Sampling makes uncertainty measurable. Nonresponse, question wording, editing, weighting, and coverage also affect interpretation. The published estimate and margin of error belong together, while technical documentation explains the methods behind them.

Before using a variable, read its concept, label, universe, and year. Similar labels can apply to different populations. An ACS estimate should not be substituted for an administrative total merely because both concern the same topic.

Torrance application segment. This local application is separate from the Census Academy instruction. The cited City of Torrance primary source is About Torrance, published at https://www.torranceca.gov/Government/About-Torrance. For a local analysis, compare a City fact with an ACS measure only after documenting that they use compatible populations, dates, and definitions. 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.