PL94: Q&A
- What's this site all about?
- What does Claritas do?
- What data are provided?
- What is the difference between an estimate and a projection?
The Claritas Census 2000 site provides free access to
Summary File 3 (SF3), Summary File 1 (SF1) and Public Law 94-171 (PL94) data.
SF3 data include social, economic and housing characteristics compiled from a sample who completed the
Census 2000 long-form questionnaire. SF1 data include age, sex, households, families, and housing. PL94 data include population, race and Hispanic/Latino counts.
Claritas has further enhanced the available Census 2000 data by calculating additional variables and offering a variety of retrieval options,
downloadable datasets, and preformatted reports (PL94 only) and maps (SF1 only).
Return to Top
In addition to offering this free site featuring value-added Claritas calculated variables, we also provide
valuable data in a variety of products and formats. Claritas is the premier provider of demographic data – by linking consumer demographics to
geography, Claritas provides the most complete source of marketing information available. The comprehensive cartographic boundaries and roster
files, coupled with expertise in analysis, provide unsurpassed marketing data! Our estimates and projections are based, in part, on the
information we collect from numerous local, regional, state and federal sources as well as private sources such as consumer list companies.
Claritas employs the leading experts on US demographics to update the projection and estimate data each year.
Claritas Highlights:
For more details about Claritas solutions, visit the ClaritasExpress site.
The Claritas Census 2000 data (SF3, SF1 and PL94) on this site are made available from the Census Bureau's recent census 2000 release.
Claritas has further enhanced the data that the census provides by calculating additional variables (SF1 and PL94) and providing different methods of geographic retrieval.
PL94 Redistricting Data are reported for 2000 census geographic definitions. Data for counties, places and county subdivisions (MCDs) reflect changes
to the corporate limits of governmental units since 1990. Data for statistical units such as census tracts and block groups reflect revisions that
have been implemented for the 2000 decennial census.
It's also worth noting that changes have been made to tabulations of persons by race. These have resulted from the ability of respondents to mark more
than one race category on the 2000 census and the fact that 1990 census race classification "Asian or Pacific Islander" has been split into two categories:
"Asian" and "Native Hawaiian and Other Pacific Islander".
Return to Top
What is the difference between an estimate and a projection?
Claritas demographic data are updated annually to reflect Current Year estimates and 5 Year projections.
An estimate looks at the population (or households, or income, etc.) today, in terms of the recent past, and is based on actual past event data.
A projection looks into the future based on a combination of today's reality and speculations or assumptions made by the analyst about the future.
Current Year data shows the estimate for present day, while 5 Year is the projected estimate.
Return to Top