ICPSR Metadata record for Demographic Components of Change File of the United States, States and Counties, 1980-1990 ICPSR ICPSR metadata records are licensed under a Creative Commons Attribution-Noncommercial 3.0 United States License (http://creativecommons.org/licenses/by-nc/3.0/us/). Demographic Components of Change File of the United States, States and Counties, 1980-1990 United States Department of Commerce. Bureau of the Census Inter-university Consortium for Political and Social Research ICPSR 2011-06-14 25361 doi://10.3886/ICPSR25361.v1
The Population Estimates Program (PEP) produces for counties each year: total population estimates and county estimates by age, sex, race, and Hispanic origin. The release of total population estimates in the winter also includes demographic components of change. In the summer, the PEP releases the estimates by age, sex, race, and Hispanic origin. The reference date for county population estimates is July 1.
 UniverseScheme25361 ICPSR.I.A.1 RCMD.IX ICPSR.I.A.4 age census county divisions counties demographic characteristics demography ethnicity gender population population characteristics population decrease population estimates population growth 1980 1990 county within state state census/enumeration data

ICPSR data undergo a confidentiality review and are altered when necessary to limit the risk of disclosure. ICPSR also routinely creates ready-to-go data files along with setups in the major statistical software formats as well as standard codebooks to accompany the data. In addition to these procedures, ICPSR performed the following processing steps for this data collection:

  • Created variable labels and/or value labels.
  • Checked for undocumented or out-of-range codes.
ICPSR
AVAILABLE. This study is freely available to the general public.
The original collector of the data, ICPSR, and the relevant funding agency bear no responsibility for use of the data or for interpretations or inferences based upon such uses.
Inter-university Consortium for Political and Social Rearch ICPSR
Ann Arbor MI
http://www.icpsr.umich.edu/ netmail@icpsr.umich.edu StudyUnit25361
The April 1, 1990, Census figures are shown as originally tabulated and do not reflect any post-Census corrections or updates which may have occurred.
StudyUnit25361
The Census Bureau's Population Estimates Program (PEP) produces July 1 estimates for years after the last published decennial census (1990), as well as for past decades. Existing data series such as births, deaths, federal tax returns, medicare enrollment, and immigration, are used to update the decennial census base counts. PEP estimates are used in federal funding allocations, in setting the levels of national surveys, and in monitoring recent demographic changes. A methodology reference accompanies most of the population estimates offerings.
StudyUnit25361

Revisions to estimates and geographic detail:

With each new issue of July 1 estimates, PEP revises estimates for years back to the last census. Previously released estimates become superseded. Revisions to estimates are usually due to input data updates, changes in methodology, or legal boundary changes. The frequency of estimates and availability of demographic detail vary by geographic level.