美国2021年人口普查数据.docx

美国2021年人口普查数据CP03SELECTED ECONOMIC CHARACTERISTICS2021 American Community Survey 1-Year EstimatesSupporting documentation on code lists, subject definitions, data accuracy, and statistical testing can be found on the American Community Survey website in the Data and Documentation section.Sample size and data quality measures (including coverage rates, allocation rates, and response rates) can be found on the American Community Survey website in the Methodology section.Although the American Community Survey (ACS) produces population, demographic and housing unit estimates, for 2021, the 2021 Census provides the official counts of the population and housing units for the nation, states, counties, cities and towns.An * indicates that the estimate is significantly different (at a 90% confidence level) than the estimate from the most current year. A "c" indicates the estimates for that year and the current year are both controlled; a statistical test is not appropriate.Data are based on a sample and are subject to sampling variability. The degree of uncertainty for an estimate arising from sampling variability is represented through the use of a margin of error. The value shown here is the 90 percent margin of error. The margin of error can be interpreted roughly as providing a 90 percent probability that the interval defined by the estimate minus the margin of error and the estimate plus the margin of error (the lower and upper confidence bounds) contains the true value. In addition to sampling variability, the ACS estimates are subject to nonsampling error (for a discussion of nonsampling variability, see Accuracy of the Data). The effect of nonsampling error is not represented in these tables.The methodology for calculating median income and median earnings changed between 2021 and 2021. Medians over $75,000 were most likely affected. The underlying income and earning distribution now uses $2,500 increments up to $250,000 for households, non-family households, families, and individuals and employs a linear interpolation method for median calculations. Before 2021 the highest income category was $200,000 for households, families and non-family households ($100,000 for individuals) and portions of the income and earnings distribution contained intervals wider than $2,500. Those cases used a Pareto Interpolation Method.Selected earnings and income data are not available for certain geographic areas due to problems with group quarters data collection and imputation. See the ACS User Notes for details.There were changes in the edit between 2021 and 2021 regarding Supplemental Security Income (SSI) and Social Security. The changes in the edit loosened restrictions on disability requirements for receipt of SSI resulting in an increase in the total number of SSI recipients in the American Community Survey. The changes also loosened restrictions on possible reported monthly amounts in Social Security income resulting in higher Social Security aggregate amounts. These results more closely match administrative counts compiled by the Social Security Administration.Employment and unemployment estimates may vary from the official labor force data released by the Bureau of Labor Statistics because of differences in survey design and data collection. For guidance on differences in employment and unemployment estimates from different sources go to Labor Force Guidance.The Census Bureau introduced an improved sequence of labor force questions in the 2021 ACS questionnaire. Accordingly, we recommend using caution when making labor force data comparisons from 2021 or later with data from prior years. For more information on these questions and their evaluation in the 2021 ACS Content Test, see the "Evaluation Report Covering Employment Status" at and the "Evaluation Report Covering Weeks Worked" at Additional information can also be found at Workers include members of the Armed Forces and civilians who were at work last week.Industry codes are 4-digit codes and are based on the North American Industry Classification System 2021. The Industry categories adhere to the guidelines issued in Clarification Memorandum No. 2, "NAICS Alternate Aggregation Structure for Use By U.S. Statistical Agencies," issued by the Office of Management and Budget.The 2021 Census occupation codes were updated in accordance with the 2021 revision of the Standard Occupational Classification (SOC). Occupation data from 2021 are not strictly comparable to data from prior years. For more information on the Census occupation code changes, please visit our website at http。