CFACT Staff Publications: William W. Yu

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Center for Financing, Access, and Cost Trends (CFACT): Publications by Staff

William W. Yu

Authors: Cohen S, Yu W
Title: The concentration and persistence in the level of health expenditures over time: Estimates for the U.S. population, 2005-2006
Publication: MEPS Statistical Brief No. 236. Available on the MEPS Web site
Date: February 2009
Abstract: In 2006, health care expenses among the U.S. community population totaled $1.034 trillion. Medical care expenses, however, are highly concentrated among a relatively small proportion of individuals in the community population. As previously reported in 1996, the top 1 percent of the U.S. population accounted for 28 percent of the total health care expenditures and the top 5 percent for more than half.

Authors: Cohen S, Yu W
Title: The utility of prediction models to oversample the long-term uninsured
Publication: Medical Care 47(1):80-7
Date: January 2009
Abstract: Available on Pub Med®.

Authors: Cohen S, Yu W
Title: The persistence in the level of health expenditures over time: Estimates for the U.S. population, 2004-2005
Publication: MEPS Statistical Brief No. 191. Available on the MEPS Web site
Date: November 2007
Abstract: Using information from the Household Component of the Medical Expenditure Panel Survey (MEPS-HC) for 2004 and 2005, this report provides detailed estimates of the persistence in the level of health care expenditures over time. Studies that examine the persistence of high levels of expenditures over time are essential to help discern the factors most likely to drive health care spending and the characteristics of the individuals who incur them.

Author: Yu W
Title: An approximation of skewed healthcare expenditure distribution using a mixture model
Publication: American Statistical Association, Joint Statistical Meetings—Section on Survey Research Methods, pp. 3919-24 (CD-ROM), Alexandria, VA
Date: 2006

Authors: Wun, L, Ezzati-Rice T, Cohen S, Yu W
Title: The impact of medical expenditure predictors in the Medical Expenditure Panel Survey (MEPS) nonresponse adjustment
Publication: American Statistical Association, Joint Statistical Meetings—Section on Survey Research Methods, pp. 3900-4 (CD-ROM), Alexandria, VA
Date: 2006

Authors: Cohen S, Yu W
Title: The persistence in the level of health expenditures over time: Estimates for the U.S. population, 2002-2003
Publication: MEPS Statistical Brief No. 124. Available on the MEPS Web site
Date: May 2006
Abstract: Using information from the Medical Expenditure Panel Survey Household Component (MEPS-HC) for 2002 and 2003, this report provides detailed estimates of the persistence in the level of health care expenditures over time. Studies that examine the persistence of high levels of expenditures over time are essential to help discern the factors most likely to drive health care spending and the characteristics of the individuals who incur them.

Authors: Cohen S, Ezzati-Rice T, Yu W
Title: The utility of extended longitudinal profiles in predicting future health care expenditures
Publication: Med Care 44(5 Suppl):I45-53
Date: May 2006
Abstract: Available on PubMed®

Author: Yu W
Title: Confidence intervals for skewed healthcare expenditure data from the Medical Expenditure Panel Survey
Publication: American Statistical Association, Joint Statistical Meetings—Section on Survey Research Methods, pp. 3725-3730 (CD-ROM), Alexandria, VA
Date: 2005

Authors: Yu W, Machlin S
Title: An examination of skewed health expenditure data from the Medical Expenditure Panel Survey (MEPS)
Publication: J Econ Social Measurem 30(2,3):127-34
Date: 2005

Authors: Cohen S, Ezzati-Rice T, Yu W
Title: The utility of probabilistic models to identify individuals with future high medical expenditures
Publication: J Econ Social Measurem 30(2,3):135-44
Date: 2005

Authors: Yu W, Ezzati-Rice T
Title: Concentration of health care expenditures in the U.S. civilian noninstitutionalized population
Publication: MEPS Statistical Brief No. 81. Available on the MEPS Web site
Date: May 2005
Abstract: Using data from the MEPS-HC for 1996 and 2002 and the National Medical Expenditure Survey (NMES) for 1987, this statistical brief presents estimates on the concentration of health care expenditures. These data indicate that health care spending is highly concentrated, with a relatively small proportion of the population accounting for a large share of total health care expenses.

Author: Yu W
Title: Examination of skewed health expenditure data from the Medical Expenditure Panel Survey (MEPS)
Publication: American Statistical Association, Proceedings of the Section on Survey Research Methods, 4674-8 (CD-ROM), Alexandria, VA
Date: 2004

Author: Yu W
Title: Precision of survey estimates derived from the Medical Expenditure Panel Survey (MEPS)
Publication: American Statistical Association, Proceedings of the Section on Survey Research Methods, pp. 4687-91 (CD-ROM), Alexandria, VA
Date: 2003

Author: Yu W
Title: Design effect variation for estimates derived from the MEPS (1996-1998)
Publication: American Statistical Association, Proceedings of the Section on Survey Research Methods, pp. 3893-8 (CD-ROM), Alexandria, VA
Date: August 2002

Authors: Machlin S, Yu W, Thorpe J
Title: Correlation between 1996 and 1997 annual medical expenditures in the U.S. civilian non-institutionalized population
Publication: American Statistical Association, Proceedings of the Section on Survey Research Methods (CD-ROM), Alexandria, VA
Date: August 2001

Authors: Baine W, Yu W, Summe J
Title: The epidemiology of hospitalization of elderly Americans for septicemia or bacteremia in 1991-1998: Application of Medicare claims data
Publication: Ann Epidemiol 11:118-26. AHRQ Pub. No. 01-R061
Date: 2001
Abstract: Available on PubMed®

Authors: Cohen S, Yu W
Title: The impact of alternative sample allocation schemes on the precision of survey estimates derived from the National Medical Expenditure Panel Survey
Publication: J Econ Soc Measurement 26:111-28. AHRQ Pub. No. 01-R056
Date: 2000
Abstract: The 1996 MEPS-HC was designed as a continuous ongoing survey to permit annual estimates of health care utilization, expenditures, insurance coverage and sources of payment for the U.S. civilian noninstitutionalized population. Selected as a nationally representative subsample from the National Health Interview Survey, it is characterized by a multistage area probability design with an oversample of households with Hispanic persons and black persons. The 1996 MEPS sample consists of 195 primary sampling units (PSUs), which contained 10,597 responding NHIS households. In this paper, the precision of survey estimates derived from a 195 PSU design is compared with precision results for alternative sample allocation schemes that preserve the number of sample respondents and the oversampling of minorities, while varying the number of PSUs and segments. The results provide insights on the impact of alternative sample allocation schemes on the precision of national health care estimates.

Author: Yu W
Title: Design effect variation in the Medical Expenditure Panel Survey (MEPS)
Publication: American Statistical Association, Proceedings of the Section on Survey Research Methods, pp. 875-80
Date: August 2000

Author: Yu W
Title: Design effects of survey estimates derived from the 1996 MEPS
Publication: American Statistical Association, Proceedings of the Section on Survey Research Methods, pp. 849-53
Date: August 1999
Abstract: The sample design of the 1996 MEPS is characterized by a multistage, complex area probability design that includes disproportionate sampling of specified policy-relevant population groups. It is expected that the variances of survey estimates derived from the 1996 MEPS will generally exhibit design effects that are greater than unity. This paper evaluates the design effects achieved for national estimates of health care utilization, expenditures, insurance coverage, and sources of payment; the level of design-effect variation in related survey estimates; and design-effect variation by alternative population subgroups and by different geographic regions of the Nation. The results may be used to help improve the sample design specification for the selection of future new sample panels of households for the annual MEPS.

Authors: Baine W, Yu W, Summe J, Weis K
Title: Epidemiologic trends in the evaluation and treatment of lower urinary tract symptoms in elderly male Medicare patients from 1991 to 1995
Publication: J Urol 160:816-20
Date: 1998
Abstract: Available on PubMed®

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