Restricting virtual weights in data envelopment analysis

Sarrico, Cláudia S.; Dyson, Robert G.

doi:10.1016/s0377-2217(03)00402-8

Cited by 127 publications

(80 citation statements)

References 13 publications

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“…However, extreme flexibility is also the object of criticism because it often produces an extreme inconsistency in the values of the shadow prices across DMUs. To avoid this inconsistency the DEA literature has suggested some solutions to restrict the range of acceptable values for those weights (Thompson et al 1996;Dyson and Thanassoulis 1988;Allen et al 1997;Roll et al 1991;Wong and Beasley 1990;Pedraja et al 1997;Sarrico and Dyson 2004).…”

Section: Methodsmentioning

confidence: 99%

Value efficiency analysis of health systems: does public financing play a role?

2010

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Aims/Background This study measures the performance of the health system in 165 countries and its relationship with public financing. Methods We use value efficiency analysis (VEA), a refinement of data envelopment analysis (DEA), to measure the efficiency of the health systems using data on healthy life expectancy and disability adjusted life years as health outcomes. Expenditure on health and education are used as inputs to the health system. Results The group of high income OECD countries shows the largest indexes of efficiency and also the lowest dispersion. In contrast, low income countries also have the most inefficient health systems, which implies that there are more opportunities for improvement. The average efficiency score is 0.96 for high income countries, 0.83 for upper-middle income countries, 0.86 for lower-middle income countries and only 0.76 for low income countries. Only 17 countries have a score equal to 1 and therefore are completely efficient and can be taken as referents. The index of efficiency is found to be positively associated with government expenditure on health as a percentage of total expenditure on health. ConclusionsThe analysis of the results shows that the public share in health expenditure and the weight of health expenditure in public budgets are two factors positively associated with the performance of the health systems. The study also highlights the advantages of using VEA over DEA in the measurement of performance.

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Section: Methodsmentioning

confidence: 99%

Value efficiency analysis of health systems: does public financing play a role?

2010

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“…This restriction imposes that the sum of the virtual weights given by each country to the noncontrollable inputs cannot exceed the virtual weight given to the controllable input. The development of this virtual weight restriction follows the approach proposed by Sarrico and Dyson [48]. Please refer to the appendix for more details on the DEA model used.…”

Section: Data and Efficiency Resultsmentioning

confidence: 99%

Assessing the efficiency of mother-to-child HIV prevention in low- and middle-income countries using data envelopment analysis

Santos

Amado

Santos

2012

Health Care Manag Sci

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AIDS is one of the most significant health care problems worldwide. Due to the difficulty and costs involved in treating HIV, preventing infection is of paramount importance in controlling the AIDS epidemic. The main purpose of this paper is to explore the potential of using Data Envelopment Analysis (DEA) to establish international comparisons on the efficiency of implementation of HIV prevention programmes. To do this we use data from 52 low-and middleincome countries regarding the prevention of mother-to-child transmission of HIV. Our results indicate that there is a remarkable variation in the efficiency of prevention services across nations, suggesting that a better use of resources could lead to more and improved services, and ultimately, prevent the infection of thousands of children. These results also demonstrate the potential strategic role of DEA for the efficient and effective planning of scarce resources to fight the epidemic.

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“…Note that model (2) In general, weight restrictions may lead to the infeasibility of DEA models (Dyson et al 2001;Sarrico and Dyson, 2004;Podinovski;2004a, 2004bSaati et al 2012;Toloo 2014a -Chameeva (2013) showed that the problem of infeasibility is only one of several possible problems that may occur in the presence of weight restrictions. The authors illustrated that the use of weight restrictions may lead to zero or negative efficiency scores of some operating units in which the production set with trade-offs involves free and/or unlimited production.…”

Section: Basic Dea Modelsmentioning

confidence: 99%