Census 2000 Margin Error
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US ONGOING INITIATIVES MEETINGS & EVENTS Home / Home / Seattle's Population & Demographics / American Community Survey / Data Issues / http://www.seattle.gov/dpd/cityplanning/populationdemographics/acs/dataissues/default.htm American Community Survey See also: Intro 1-Year 3-Year 5-Year Data Issues Data IssuesAmerican Community Survey data provides the most in-depth picture of Seattle’s population and housing. ACS estimates need to be interpreted carefully and can be complicated to use so you should educate yourself on the basics of the ACS. The Census Bureau’s Compass margin of Products can help you effectively use the ACS data while navigating the challenges involved.It is very important to recognize that, as a sample survey, the American Community Survey provides information on the characteristics of the population – and is not meant to count the population. You should keep in mind that ACS estimates carry margin of error larger margins of error than decennial census sample estimates. This is especially true for small areas and population groups.Know Your Estimate SeriesEstimates from the ACS represent the characteristics of the population and housing over a period of time: 1 year, 3 years, or 5 years, depending on the estimate series. (For example, the 5-year ACS estimates provide a weighted average of ACS responses collected over 60 months.) Because ACS estimates are for a whole period of time, you cannot use ACS estimates to determine what is happening at any particular day, month, or year. This is crucial to keep in mind for periods with a great deal of change.It is important to select the estimate series that best suits your needs. Depending on the desired geography, there may be up to three different estimates to choose from:1-year series Data collected over a 12-month periodPopulations of 65,000+Smallest sample, less reliable, most currentBest used: Currency is more important than precisionAnalyzing large populations3-ye