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Data Envelopment Analysis in the Presence of Measurement Error: Case Study from the National Database of Nursing
Byron J Gajewski1, Robert Lee, Nancy Dunton
1Department of Biostatistics, University of Kansas School of Medicine, Kansas City, KS, USA, 66160 ; University of Kansas School of Nursing, Kansas City, KS, USA 66160.
Abstract:
Data Envelopment Analysis (DEA) is the most commonly used approach for evaluating healthcare efficiency (Hollingsworth, 2008), but a long-standing concern is that DEA assumes that data are measured without error. This is quite unlikely, and DEA and other efficiency analysis techniques may yield biased efficiency estimates if it is not realized (Gajewski, Lee, Bott, Piamjariyakul and Taunton, 2009; Ruggiero, 2004). We propose to address measurement error systematically using a Bayesian method (Bayesian DEA). We will apply Bayesian DEA to data from the National Database of Nursing Quality Indicators® (NDNQI®) to estimate nursing units' efficiency. Several external reliability studies inform the posterior distribution of the measurement error on the DEA variables. We will discuss the case of generalizing the approach to situations where an external reliability study is not feasible.
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