Census of Population and Housing Public Use Microdata Samples (1% Sample)
Study Number	S04_80,S04_90
Background of Dataset
Purpose of the Data Set	These data sets were extracted from the U.S. census so that users can prepare tabulations of census data that are not available in census summary files.
Criteria(s) for Inclusion/Exclusion	All persons and housing units in the U.S.
Age Range Included	All
Method(s) of Data Gathering	Questionnaires were collected by mail or by canvassing neighborhoods.
Sampling Frame/Design	The sampling unit was a household or an individual living in an institution. In smaller communities, every other household was included in the sample. In other communities, every sixth household was included in the sample.
Limitation(s) of Study
Year(s) Available	1980, 1990
Number of Observations	2,380,927 in 1980; 2,683,202 in 1990
Unit of Observation	Households or persons living in institutions
Publisher	U.S. Department of Commerce, Bureau of the Census
Contact Information/Web Address	http://www.census.gov/
Condition of Use	None.
Contents of Database
Key Linking Variables
•Patient identifier
•Physician identifier
•Health facility identifier
•Geographic identifier	State, public use microdata area (PUMA), MSA
•Other identifier
Demographics Information
•Sex	Yes
•Race	Yes
•Geographic location	State, PUMA, MSA
•Income	Yes
•Education	Yes
•Employment status	Yes
•Others	Family composition, ancestry
Access/Utilization Information	N/A
Health Care Facility Information	N/A
Physician Information	N/A
Cost/Expenditure Information	N/A
Other information
•Type of work	Yes
•Characteristics of housing units	Yes
• Other information including military service, personal care limitations, work limitation, weight, place of birth	Yes