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Modeling Area-Level Health Rankings
Charles Courtemanche1,2, Samir Soneji3, Rusty Tchernis1,2
1Department of Economics, Andrew Young School of Policy Studies, Georgia State University, Atlanta, GA.
Objective:
Rank county health using a Bayesian factor analysis model.
Data Sources:
Secondary county data from the National Center for Health Statistics (through 2007) and Behavioral Risk Factor Surveillance System (through 2009).
Study Design:
Our model builds on the existing county health rankings (CHRs) by using data-derived weights to compute ranks from mortality and morbidity variables, and by quantifying uncertainty based on population, spatial correlation, and missing data. We apply our model to Wisconsin, which has comprehensive data, and Texas, which has substantial missing information.
Data Collection Methods:
The data were downloaded from www.countyhealthrankings.org.
Principal Findings:
Our estimated rankings are more similar to the CHRs for Wisconsin than Texas, as the data-derived factor weights are closer to the assigned weights for Wisconsin. The correlations between the CHRs and our ranks are 0.89 for Wisconsin and 0.65 for Texas. Uncertainty is especially severe for Texas given the state's substantial missing data.
Conclusions:
The reliability of comprehensive CHRs varies from state to state. We advise focusing on the counties that remain among the least healthy after incorporating alternate weighting methods and accounting for uncertainty. Our results also highlight the need for broader geographic coverage in health data.
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