Source and Accuracy of Estimates for the June 1998 CPS
Microdata File on Fertility and Birth Expectations
SOURCE OF DATA
The data in this microdata file come from the June 1998 Current Population Survey (CPS). The Bureau
of the Census conducts the survey every month, although this file has only June data. The June survey
uses two sets of questions, the basic CPS and the supplement.
Basic CPS. The basic CPS collects primarily labor force data about the civilian noninstitutional
population. Interviewers ask questions concerning labor force participation about each member 15 years
old and over in every sample household.
Sample design. The present CPS sample was selected from the 1990 Decennial Census files with
coverage in all 50 states and the District of Columbia. The sample is continually updated to account for
new residential construction. The United States was divided into 2,007 geographic areas. In most states,
a geographic area consisted of a county or several contiguous counties. In some areas of New England
and Hawaii, minor civil divisions are used instead of counties. A total of 754 geographic areas were
selected for sample. About 50,000 occupied households are eligible for interview every month.
Interviewers are unable to obtain interviews at about 3,200 of these units. This occurs when the
occupants are not found at home after repeated calls or are unavailable for some other reason.
Since the introduction of the CPS, the Bureau of the Census has redesigned the CPS sample several
times. These redesigns have improved the quality and accuracy of the data and have satisfied changing
data needs. The most recent changes were completely implemented in July 1995.
June Supplement. In addition to the basic CPS questions, interviewers asked supplementary questions
in June about fertility of women between 15 and 44 years of age.
Estimation procedure. This survey's estimation procedure adjusts weighted sample results to agree
with independent estimates of the civilian noninstitu