hus14

additional information have averaged 165 fatal occupational
injuries per year, or less than 4% of the annual total.
Beginning with 2003 data, CFOI began using the 2002 North
American Industry Classification System (NAICS). Starting
with 2009 data, CFOI began using the 2007 NAICS to classify
industries. In Health, United States, industry data are
presented at the two-digit level. Most of the differences
between the 2002 and 2007 NAICS are at a more detailed
level. Therefore, the adoption of the 2007 NAICS for CFOI is
unlikely to affect the trend presented in Health, United States.
(See Appendix II, Industry of employment.)
Reference
Bureau of Labor Statistics. Revisions to the 2012 Census
of Fatal Occupational Injuries (CFOI) counts. Washington,
DC: U.S. Department of Labor; 2014. Available from:
http://www.bls.gov/iif/oshwc/cfoi/cfoi_revised12.pdf.
For More Information. See the CFOI website at:
http://www.bls.gov/iif/oshcfoi1.htm and the CFOI section
of the BLS Handbook of Methods at: http://www.bls.gov/
opub/hom/pdf/homch9.pdf.
Current Population Survey (CPS)
Bureau of Labor Statistics (BLS) and U.S. Census
Bureau
Overview. CPS provides current estimates and trends in
employment, unemployment, poverty, and other
characteristics of the general labor force, the population as a
whole, and various population subgroups.
Coverage. The Census 2000-based basic CPS sample was
introduced in April 2004, and implementation was
completed by July 2005 with coverage in every state and
D.C. For CPS labor force data, the adult universe (i.e., the
population of marriageable age) is composed of persons
aged 15 and over in the civilian noninstitutionalized
population. The sample for the March CPS supplement was
expanded to include members of the Armed Forces who are
living in a household with at least one civilian adult, as well
as additional Hispanic households that are not included in
the monthly labor force estimates.
Methodology. The CPS interview is divided into three basic
parts: (a) household and demographic information, (b) labor
force information, and (c) supplement information for
months that include supplements. Comprehensive work
experience information is gathered on the employment
status, occupation, and industry of persons interviewed.
Estimates of poverty presented in Health, United States from
CPS are derived from the Annual Social and Economic
Supplement (ASEC), formerly called the Annual
Demographic Supplement (ADS) and commonly called the
March Supplement. ASEC collects data on family
characteristics, household composition, marital status,
migration, income from all sources, weeks worked, time
spent looking for work or on layoff from a job, occupation
and industry classification of the job held for the longest
during the year, and receipt of noncash benefits (such as
food stamps, school lunch program, employer-provided
group health insurance plan, personal health insurance,
Medicaid, Medicare, Tricare or military health care, and
energy assistance).
The basic CPS sample is selected from multiple frames using
multiple stages of selection. Each unit is selected with a
known probability to represent similar units in the universe.
The sample design is state-based, with the sample in each
state being independent of the others. One person generally
responds for all eligible members of a household.
The additional Hispanic sample is from the previous
November's basic CPS sample. If a person is identified as
being of Hispanic origin from the November interview and is
still residing at the same address in March, that housing unit
is eligible for the March survey. This amounts to a neardoubling
of the Hispanic sample because there is no overlap
of housing units between the basic CPS samples in
November and March.
The final CPS sample weight is the product of the basic
weight, the adjustments for special weighting, the
noninterview adjustment, the first-stage ratio adjustment
factor, and the second-stage ratio adjustment factor. This
final weight should be used when producing estimates from
the basic CPS data. Differences in the questionnaire, sample,
and data uses for the March CPS supplement result in the
need for additional adjustment procedures to produce what
is called the March Supplement weight.
Sample Size and Response Rate. Beginning with 2001, the
Children’s Health Insurance Program (CHIP) sample
expansion was introduced. This included an increase in the
basic CPS sample to 60,000 households per month. Prior to
2001, estimates were based on 50,000 households per
month. The expansion also included an additional 12,000
households that were allocated differentially across states,
based on prior information of the number of uninsured
children in each state, to produce statistically reliable current
state data on the number of low-income children who do
not have health insurance coverage. In an average month,
the nonresponse rate for the basic CPS is about 7%–8%.
Issues Affecting Interpretation. Over the years, the number of
income questions has expanded, questions on work
experience and other characteristics have been added, and
the month of interview was moved to March. In 2002, an
ASEC sample increase was implemented, requiring more
time for data collection. Thus, additional ASEC interviews are
now taking place in February and April. However, even with
this sample increase, most of the data collection still occurs
in March.
In 1994, major changes were introduced that included a
complete redesign of the questionnaire and the
introduction of computer-assisted interviewing for the
360 Appendix I. Data Sources Health, United States, 2014