Public Use Microdata Sample (PUMS) Files
-- developing and using custom demographic estimates
Public Use Microdata Sample (PUMS) files provide a way to develop custom estimates of demographic summary statistics for Public Use Microdata Areas (PUMAs), states and the U.S. This section is focused on selected PUMS files enabling custom estimates for 2010 PUMAs:
Census 2010 PUMS (released November 2014)
American Community Survey 2012 (ACS 2012) 1-year PUMS (released Sept 2013)
American Community Survey 2013 (ACS 2013) 1-year PUMS (released Sept 2014)
Click link to open corresponding PUMS page.
These PUMS files are comprised of samples of individual respondent person and housing unit records. The ACS PUMS files are released annually providing a means to develop similar custom estimates with annual updates.
For example, public and private school enrollment by grade for specific universes (e.g. by other attributes of person such as language spoken, poverty status etc.) not available elsewhere. These summary statistic estimates can be developed using the PUMS data using crosstab software. The CV XE Crosstabs section provides a step-by-step example of developing these estimates. School enrollment is one among many demographic items that can be estimated. Thousands of subject matter combinations are possible.
Public Use Microdata Sample (PUMS) files contain a sample of respondent level data from a decennial census or American Community Survey (ACS). Each record in the person file represents a single person; each record in the housing unit file represents a single housing unit. In the person-level file, individuals are organized into households, making possible the study of people within the contexts of their families and other household members. Each person or housing unit record contains fields/variables for nearly every question in the census/survey, as well as many new items derived responses (such as poverty status). Each annual ACS PUMS file contains data on approximately one percent of the U.S. population.
Since all responses are confidential, many variables in the PUMS file have been modified to protect the confidentiality of survey respondents. For instance, particularly high incomes are "top-coded", uncommon birthplace or ancestry responses are grouped into broader categories, and the PUMS file provides a very limited set of geographic variables.
Census 2000 PUMS ... uses Census 2000 PUMAs ... earlier PUMS available
ACS2008 .. ACS2011 PUMS uses Census 2000 PUMAs
ACS2012 PUMS ... uses Census 2010 PUMAs released fall 2013
ACS20y1 PUMS ... uses Census 2010 PUMAs released fall 20y2; future years y1=13 forward; y2=y1+1
Census 2010 PUMS
Other PUMS available; covered in other sections
PUMAs Data for Public Use Microdata Areas
While PUMS files contain data for respondents across the U.S., most lower level geography are not identified by any variables in the PUMS files. The most detailed unit of geography contained in the PUMS files is the Public Use Microdata Area (PUMA). See details about PUMAs and interactive table.
PUMAs are special non-overlapping areas that partition each state into contiguous geographic units containing no fewer than 100,000 people each. 2010 PUMAs were built on census tracts, and cover the entirety of the United States, Puerto Rico, Guam, and the U.S. Virgin Islands.
Developing PUMS Custom Estimates
The CV XE Crosstabs tool can be used with the PUMS files to develop custom estimates. See examples
Mapping PUMAs -- reference and thematic pattern applications
What are the PUMA boundaries? How do they relate to other geography? Use the CV XE GeoGateway to view PUMA shapefiles. Zoom into one or a set of PUMAs. Overlay county or other geography. Integrate your PUMS summary statistic estimates into the PUMA shapefiles; display thematic pattern maps of the custom estimates. See these illustrative PUMA applications.
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ProximityOne develops geographic-demographic-economic data and analytical tools and helps organizations knit together and use diverse data in a decision-making and analytical framework. We develop custom demographic/economic estimates and projections, develop geographic and geocoded address files, and assist with impact and geospatial analyses. Wide-ranging organizations use our tools (software, data, methodologies) to analyze their own data integrated with other data. Follow ProximityOne on Twitter at www.twitter.com/proximityone. Contact ProximityOne (888-364-7656) with questions about data covered in this section or to discuss custom estimates, projections or analyses for your areas of interest.