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A geometrical approach for fuzzy DEA frontiers. Repositório Alice
BIONDI NETO, L.; MELLO, J. C. C. B. S. de; MEZA, L. A.; GOMES, E. G..
Interval DEA frontiers are here used in situation where one input or output is subject to uncertainty in its measurement and is presented as an interval data. We built an efficient frontier without any assumption about the probability distribution function of the imprecise variable. We take into account only the minimum and the maximum values of each imprecise variable. Two frontiers are constructed: the optimistic and the pessimistic ones. We use fuzszy relationships to introduce a new efficiency index based on a set of some Fuzzy T Norms. We will explore only the case where only on single variable presents a certain degree of uncertainty.
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Data envelopment analysis; Fuzzy sets; Interval data.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/659429
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A new methodology for assessing the impact of water-pricing scenarios: case study of small-scale irrigation schemes in South Africa AgEcon
Speelman, Stijn; Frija, Aymen; Farolfi, Stefano; Buysse, Jeroen; D'Haese, Marijke F.C.; D'Haese, Luc.
Worldwide growing water scarcity has increased the call for economic instruments to stimulate rational water use in agriculture. In addition cost-recovery is now widely accepted as a cornerstone of sustainable water management. As a consequence now in developing countries, where currently agricultural water use is often still heavily subsidized, a tendency exists of introducing water-pricing as a policy to achieve more sustainable water use. The exact impact of water pricing policies on irrigation water use or on the farmers’ production system is however mostly unknown. A new two-stage methodology that allows estimating at the farm level the effects of introducing or raising a water price on the agricultural production process and water demand is...
Tipo: Conference Paper or Presentation Palavras-chave: Water-pricing; Water savings; Irrigation; Data envelopment analysis; South Africa; Resource /Energy Economics and Policy.
Ano: 2008 URL: http://purl.umn.edu/43836
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A Two-Stage Value Chain Model for Vegetable Marketing Chain Efficiency Evaluation: A Transaction Cost Approach AgEcon
Lu, Hualiang.
We applied a two-stage value chain model to investigate the effects of input application and occasional transaction costs on vegetable marketing chain efficiencies with a farm household-level data set. In the first stage, the production efficiencies with the combination of resource endowments, capital and managerial inputs, and production techniques were evaluated; then at the second stage, the marketing technical efficiencies were determined under the marketing value of the vegetables for three typical marketing chains in Nanjing area, P.R. China. The impacts of the transaction costs to the supply chain technical efficiency both at the production and marketing stages were examined by using Tobit model. Study showed that transaction costs significantly...
Tipo: Conference Paper or Presentation Palavras-chave: Two-stage value chain model; Data envelopment analysis; Technical efficiency; Transaction cost; Vegetable; China; Industrial Organization; D1; D8; Q13; Q18.
Ano: 2006 URL: http://purl.umn.edu/25327
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Agricultural Economics Education in Ukrainian Agricultural Universities: An Efficiency Analysis Using Data Envelopment Analysis AgEcon
Lissitsa, Alexej; Coelli, Tim J.; Rao, D.S. Prasada.
Ukraine's transition from a centrally-planned to a market economy has had a profound effect upon its agricultural sector and agricultural universities. A substantial reduction in state financing has forced universities to adopt a range of survival strategies, with varying degrees of success. In this paper we use data envelopment analysis to examine the technical efficiency of 44 agricultural economics programs from 19 Ukrainian universities during the 2002/03 academic year. Our empirical results indicate wide disparities in performance, ranging from 36% to 100% technical efficiency. A second-stage analysis suggests that factors such as student demand, commercial activities and staff quality help explain a portion of this variation.
Tipo: Conference Paper or Presentation Palavras-chave: Higher education; Ukraine; Efficiency; Data envelopment analysis; Teaching/Communication/Extension/Profession; I21; C14; Q16.
Ano: 2005 URL: http://purl.umn.edu/24482
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Análise multidimensional de consórcios cenoura-alface sob diferentes combinações de densidades populacionais Repositório Alice
BEZERRA NETO, F.; GOMES, E. G.; NUNES, G.H. de S.; JÚNIOR, A.P.B..
Este trabalho teve como objetivo avaliar o desempenho biológico de sistemas consorciados de cenoura e alface, sob diferentes combinações de densidades populacionais, com uso das análises bivariada de variância e envoltória de dados (DEA). O delineamento experimental usado foi o de blocos ao acaso completos, com cinco repetições, com os tratamentos arranjados em esquema fatorial 4x4. Os tratamentos resultaram da combinação de quatro populações de plantas de cenoura (40, 60, 80 e 100% da população recomendada no cultivo solteiro - PRCS) com quatro populações de plantas de alface (40, 60, 80 e 100% da PRCS). As populações recomendadas para os cultivos solteiros da cenoura e alface foram 500 mil e 250 mil plantas por hectare, respectivamente. Tanto o método...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Daucus carota; Lactuca sativa; Análise bivariada; Análise envoltória de dados; Experimentos consorciados; Bivariate analysis; Data envelopment analysis; Intercropping experiments.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/122842
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Análisis de la productividad en las entidades federativas de México. Colegio de Postgraduados
Freire Basantes, Verónica del Carmen.
En esta investigación se realizó un análisis comparativo de los cambios en la productividad de las entidades federativas de México, durante el período 2005-2010. Para estimar la productividad se utilizó la metodología basada en el Análisis Envolvente de Datos (DEA), bajo el Índice de Productividad de Malmquist (IPM), empleando como producto al PIB estatal y como insumos al capital y mano de obra. Los resultados muestran un descenso general en la productividad del 2005 al 2009, con una recuperación en el 2010; esto se debió principalmente al componente de cambio tecnológico, más que a cambios en la eficiencia técnica. Los desequilibrios regionales principalmente del cuarto período que reflejan los resultados del IPM coinciden con la crisis financiera del...
Palavras-chave: Método envolvente de datos; Inventario de capital; Productividad; Doctorado; Economía; Data envelopment analysis; Capital stock; Productivity.
Ano: 2012 URL: http://hdl.handle.net/10521/1767
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Analyzing Differences in Rural Hospital Efficiency: A Data Envelopment Analysis Approach AgEcon
Nedelea, I. Cristian; Fannin, James Matthew; Barnes, James N..
This study analyzes difference in efficiency among the U.S. rural hospitals using a two-stage, semi-parametric approach. Data Envelopment Analysis is used in the first stage to calculate cost, technical and allocative efficiencies of Critical Access Hospitals (CAH) and non-CAH rural hospitals. Following Simar and Wilson (2007), bootstrapped truncated regressions are used in the second stage to infer on relationship between the cost, technical and allocative inefficiencies of hospitals and some environmental variables. The estimated results show that CAHs are less cost, technical and allocative efficient than non-CAH rural hospitals. The results also show that Medicare cost-based reimbursement for CAHs has a negative effect on the efficiency of these...
Tipo: Conference Paper or Presentation Palavras-chave: Efficiency; Two-stage; Semi-parametric; Bootstrap; Data envelopment analysis; Health Economics and Policy; I12; I18.
Ano: 2010 URL: http://purl.umn.edu/61391
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Application of nonparametric method to improve energy productivity and CO2 emission for barley production in Iran CIGR Journal
Ghasemi Mobtaker, Hassan; Taki, Morteza; Salehi, Marzie; Zarei Shahamat, Ebrahim.
The nonparametric method of data envelopment analysis (DEA) was used to investigate the energy efficiency and CO2 emission of barley farm in Hamedan province of Iran.  The method was used based on eight energy inputs including human labor, machinery, diesel fuel, fertilizers, farmyard manure, biocide, electricity and seed energy and single output of barley yield and technical, pure technical, scale and cross efficiencies were calculated using CCR and BCC models.  The results showed that the average values of technical, pure technical and scale efficiency scores of farmers were 0.788, 0.941 and 0.833, respectively.  Also, energy saving target ratio for barley production was calculated as 11.45%, indicating that by following the recommendations of this...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Data envelopment analysis; Energy saving; Barley; Chemical fertilizers.
Ano: 2013 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2618
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Are Hospitals Seasonally Inefficient? Evidence from Washington State Hospitals AgEcon
Friesner, Daniel L.; McPherson, Matthew Q.; Rosenman, Robert.
Efficiency measurement has been one of the most extensively explored areas of health services research over the past two decades. Despite this attention, few studies have examined whether a provider’s efficiency varies on a monthly, quarterly or other, sub-annual basis. This paper presents an empirical study that looks for evidence of seasonal inefficiency. Using a quarterly panel of general, acute-care hospitals from Washington State, we find that hospital efficiency does vary over time; however, the nature of this dynamic inefficiency depends on the type of efficiency being measured. Our results suggest that technical and cost efficiency vary by quarter. Allocative and scale efficiency also vary on a quarterly basis, but only if the data are jointly...
Tipo: Working or Discussion Paper Palavras-chave: Seasonality; Efficiency; Hospitals; Data envelopment analysis; Health Economics and Policy.
Ano: 2006 URL: http://purl.umn.edu/12957
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Assessing programmes for the provision of agri-environmental services – An efficiency analysis realized in Southern Germany AgEcon
Kantelhardt, Jochen; Eckstein, Karin; Hoffmann, Helmut.
Agricultural land use does not only concern farmers, but is of high relevance for the environment. Agri-environmental programmes aim to foster the environmental soundness of agricultural production. The aim of this study is to analyse the impact of agri-environmental programmes on the economic and the environmental performance of farms. Using the nonparametric method of Data Envelopment Analysis (DEA), we calculated the economic as well as the environmental efficiencies of farms and examined whether farms are able to succeed in combining environmental and economic efficiency. As study object serves a South German agri-environmental programme, the Bavarian KULAP. A farm survey was conducted covering a total of 102 farmers. The results show that farmers who...
Tipo: Conference Paper or Presentation Palavras-chave: Agri-environmental programme; Data envelopment analysis; Environmental efficiency; Economic efficiency; Environmental Economics and Policy; Productivity Analysis; Resource /Energy Economics and Policy.
Ano: 2009 URL: http://purl.umn.edu/51688
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COST EFFICIENCY OF CATFISH FARMS IN CHICOT COUNTY, ARKANSAS: THE IMPACT OF EXTENSION SERVICES AgEcon
Engle, Carole R.; Kaliba, Aloyce R..
Cost efficiency measures of a sample of catfish farms in Chicot County, Arkansas are estimated using a data envelopment analysis technique. A measure of overall efficiency is used to determine operator's characteristics, farm practices, and institutional support services that are likely to lead to higher farm level cost efficiency. Results indicate that live catfish production could increase by 55% using the same level of inputs if all farms were operating at the minimum average cost curve. Higher feeding rate and availability of extension services were associated with increased cost efficiency. Higher stocking density affected overall efficiency negatively. The marginal value of extension contacts in Chicot County was estimated to be $2988. This study...
Tipo: Conference Paper or Presentation Palavras-chave: Catfish; Cost efficiency; Data envelopment analysis; And extension services; Resource /Energy Economics and Policy; C14; C24; D61.
Ano: 2004 URL: http://purl.umn.edu/34740
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Different t-norms for DEA-fuzzy eficiency computations. Repositório Alice
MEZA, L. A.; GOMES, E. G.; MELLO, J. C. C. B. S. de; BIONDI NETO, L..
2009
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Data envelopment analysis; Fuzzy sets; Interval data.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/659436
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Do farmers provide agri-environmental services efficiently? – An economic analysis AgEcon
Kantelhardt, Jochen; Eckstein, Karin.
Agricultural land use does not only concern farmers, but also has a large number of social and environmental effects. Consequently, it is to be assumed that farmers have to use financial resources as well as labour in order to provide these services. Using the nonparametric method of Data Envelopment Analysis (DEA), we calculated the economic as well as the ecological efficiencies of farms and examined whether farms are able to succeed in combining ecological and economic efficiency. In addition to this analysis, we studied the driving factors of the respective efficiencies. The study was carried out in four typical production regions in Bavaria which vary in their proportions of grassland as well as their yield potential; thus, the study regions reflect a...
Tipo: Conference Paper or Presentation Palavras-chave: Agricultural land use; Data envelopment analysis; Ecological efficiency; Economic efficiency; Environmental Economics and Policy.
Ano: 2007 URL: http://purl.umn.edu/7973
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Do Field Crop Farms and Mixed Farms of Old and New EU Members Improve Productivity at the Same Rate? A Regional Level Approach AgEcon
Blasejczyk-Majka, Lucyna; Kala, Radoslaw; Maciejewski, Krzysztof.
data contained in the Farm Accounting Data Network (FADN). Analyses covered the first four years following the extension of the European Union in 2004. The adopted units comprised average farms representing 80 regions belonging to eleven countries of EU-15 and four new EU member states. Estimation of the Malmquist total factor productivity (TFP) and its components was conducted using data envelopment analysis, separately for each of the two types of farms taking into consideration their economic size. The main findings concerning the pure technical efficiency change indicate that in the units from the old regions there was a slight improvement for field crop farms and stagnation for mixed farms, and a decrease in the units from the new regions, being...
Tipo: Conference Paper or Presentation Palavras-chave: Data envelopment analysis; Technical efficiency change; Scale efficiency change; Malmquist index; Crop Production/Industries; Productivity Analysis.
Ano: 2011 URL: http://purl.umn.edu/114254
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Does Farm Size and Specialization Matter for Productive Efficiency? Results from Kansas AgEcon
Mugera, Amin W.; Langemeier, Michael R..
In this article, we used bootstrap data envelopment analysis techniques to examine technical and scale efficiency scores for a balanced panel of 564 farms in Kansas for the period 1993–2007. The production technology is estimated under three different assumptions of returns to scale and the results are compared. Technical and scale efficiency is disaggregated by farm size and specialization. Our results suggest that farms are both scale and technically inefficient. On average, technical efficiency has deteriorated over the sample period. Technical efficiency varies directly by farm size and the differences are significant. Differences across farm specializations are not significant.
Tipo: Journal Article Palavras-chave: Bootstrap; Data envelopment analysis; Efficiency; Farms; Farm Management; Production Economics; D24; Q12.
Ano: 2011 URL: http://purl.umn.edu/117947
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Economic and Marketing Efficiency Among Corn Ethanol Plants AgEcon
Sesmero, Juan P.; Perrin, Richard K.; Fulginiti, Lilyan E..
We extend data envelopment analysis (DEA) to decompose the economic efficiency of a sample of ethanol plants into internal (technical and allocative) and boundary (marketing) sources. This decomposition allows us to evaluate the channels through which different plant characteristics affect plant performance. Results show that plants are very efficient from a technical point of view. Plants with higher production volumes seem to perform better not because of economies of scale but because they can secure more favorable prices (higher marketing efficiency) and execute production plans accordingly (higher allocative efficiency). This may rationalize the increase in the size of the average plant observed in the industry in recent years despite evidence of...
Tipo: Conference Paper or Presentation Palavras-chave: Corn ethanol; Data envelopment analysis; Economic efficiency decomposition; Marketing efficiency; Mergers; Crop Production/Industries; Marketing; Production Economics.
Ano: 2011 URL: http://purl.umn.edu/100709
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Economic and Marketing Efficiency Among Corn Ethanol Plants AgEcon
Sesmero, Juan P.; Perrik, Richard K.; Fulginiti, Lilyan E..
In the corn ethanol industry, the ability of plants to obtain favorable prices through marketing decisions is considered important for their overall economic performance. Based on a panel of surveyed of ethanol plants we extend data envelopment analysis (DEA) to decompose the economic efficiency of plants into conventional sources (technical and allocative efficiency) and a new component we call marketing efficiency. The latter measure allows us to evaluate plants’ ability to contract favorable prices of corn and ethanol relative to spot market prices and its implications for their overall economic performance. Results show that plants are very efficient from a technical point of view. Dispersion in overall economic performance observed across units is...
Tipo: Conference Paper or Presentation Palavras-chave: Corn ethanol; Data envelopment analysis; Economic efficiency decomposition; Marketing efficiency; Mergers; Environmental Economics and Policy.
Ano: 2011 URL: http://purl.umn.edu/101001
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Economic Efficiency of Ethanol Plants in the US North Central Region AgEcon
Sesmero, Juan P.; Perrin, Richard K.; Fulginiti, Lilyan E..
In this study we use data envelopment analysis to decompose the overall economic efficiency of a sample of ethanol plants into three subcomponents: technical efficiency, allocative efficiency and a new component we call marketing efficiency. The relative importance of these sources of efficiency is of particular interest given the recent history of bankruptcies, plant closings and ownership change in the industry. Results reveal that observed production units are very efficient from a technical point of view as suggested by a standard deviation of 1% in technical efficiency. However, our results also show that bigger plants tend to be more economically efficient than others. The conventional methodology would have identified this difference as coming from...
Tipo: Conference Paper or Presentation Palavras-chave: Ethanol; Data envelopment analysis; Efficiency decomposition; Marketing efficiency; Resource /Energy Economics and Policy.
Ano: 2010 URL: http://purl.umn.edu/61639
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Efficiency and productivity change of Estonian dairy farms from 2001 - 2009 AgEcon
Luik, Helis; Omel, Raul; Viira, Ants-Hannes.
The purpose of this paper is to analyse productivity change of Estonian dairy farms during the period 2001-2009. Data envelopment analysis (DEA) was used to estimate the technical efficiency of producers and Malmquist productivity index for analysis of productivity change. Estonian FADN data was used in analysis. Performed analysis indicated that Estonian EU accession in 2004 increased considerably total factor productivity. Farm gate milk prices have considerable effect on total factor productivity change. Number of cows and milk yield has positive and dependence on subsidies, stocking density and capital to working hours ratio have negative effects on total factor productivity change.
Tipo: Conference Paper or Presentation Palavras-chave: Malmquist productivity index; Technical efficiency; Technical change; Data envelopment analysis; Dairy production; Livestock Production/Industries; Productivity Analysis.
Ano: 2011 URL: http://purl.umn.edu/114583
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Efficiency and sustainability assessment for a group of farmers in the Brazilian Amazon. Repositório Alice
GOMES, E. G.; MELLO, J. C. C. B. S. de; SOUZA, G. da S. e; MEZA, L. A.; MANGABEIRA, J. A. de C..
The aim of this paper is to use DEA models to evaluate sustainability in agriculture. Several variables are taken into account and the resulting efficiency is measured by comparison. The performance of family farms is analysed here (variables: farmed area, work force, and production). As agricultural sustainability depends on the maintenance of systems of production for long periods of time, the models were run for the years of 1986 and 2002. Tiered DEA models were used to group farmers in sustainability categories. Non-parametric regression models were used to identify the factors affecting the efficiency measurements. All the results indicate that the majority of the farmers increased their efficiency along the time. These improvements may support the...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Data envelopment analysis; Iso - efficiency tiers; Regression; Family farms..
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/657362
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