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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
27/06/1995 |
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Data da última atualização: |
27/06/1995 |
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Autoria: |
LEON, L. A.; LOPEZ, A. S.; VLEK, P. L. G. |
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Título: |
Micronutrient problems in tropical Latin America. |
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Ano de publicação: |
1985 |
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Fonte/Imprenta: |
Fertil. Res., v.7, p.95-129, 1985. |
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Idioma: |
Português |
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Palavras-Chave: |
CALAGEM (pH); REVISAO; VARIOS ELEMENTOS. |
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Thesagro: |
Cobre; Nitrogênio; Temperatura. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00512naa a2200205 a 4500
001 1606178
005 1995-06-27
008 1985 bl --- 0-- u #d
100 1 $aLEON, L. A.
245 $aMicronutrient problems in tropical Latin America.
260 $c1985
650 $aCobre
650 $aNitrogênio
650 $aTemperatura
653 $aCALAGEM (pH)
653 $aREVISAO
653 $aVARIOS ELEMENTOS
700 1 $aLOPEZ, A. S.
700 1 $aVLEK, P. L. G.
773 $tFertil. Res.$gv.7, p.95-129, 1985.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Unidades Centrais. Para informações adicionais entre em contato com biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
10/05/2013 |
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Data da última atualização: |
10/05/2013 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
MELLO, J. C. C. B. S. de; MEZA, L. A.; SILVEIRA, J. Q. da; GOMES, E. G. |
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Afiliação: |
João Carlos C. B. Soares de Mello, Universidade Federal Fluminense; Lidia Angulo Meza, Universidade Federal Fluminense; Juliana Quintanilha da Silveira, Universidade Federal Fluminense; ELIANE GONCALVES GOMES, SGE. |
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Título: |
About negative efficiencies in cross evaluation BCC input oriented models. |
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Ano de publicação: |
2013 |
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Fonte/Imprenta: |
EUROPEAN JOURNAL OF OPERATIONAL RESEARCH. n. 229. 732-737 p. 2013. |
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Idioma: |
Inglês |
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Conteúdo: |
It will be shown in this paper that the input oriented DEA BCC model can generate negative efficiencies that are usually hidden in the model. The impact of these negative efficiencies becomes obvious when using input oriented Cross Evaluation models. With the help of an example with one input and one output, the conditions for the possible occurrence of negative efficiencies will be shown. Furthermore, we will show that a small intuitive change in the BCC multipliers model, previously presented in other papers, corrects this situation. We show why this change is used and compared it with an alternative formulation, which avoid negative efficiencies, namely the Non-Decreasing Returns to Scale (NDRS) model. We also show that the formulation studied in this paper is less restrictive than the NDRS model. The study of this variation in the DEA BCC model will be complemented with the formulation of the dual envelope model. This model changes the original frontier. Using the concept of non-observed DMUs, those variations can be graphically analyzed. We have also carried out some algebraic studies concerning benchmarks, multipliers and returns to scale. |
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Palavras-Chave: |
Evaluation model. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01687naa a2200169 a 4500
001 1957636
005 2013-05-10
008 2013 bl uuuu u00u1 u #d
100 1 $aMELLO, J. C. C. B. S. de
245 $aAbout negative efficiencies in cross evaluation BCC input oriented models.$h[electronic resource]
260 $c2013
520 $aIt will be shown in this paper that the input oriented DEA BCC model can generate negative efficiencies that are usually hidden in the model. The impact of these negative efficiencies becomes obvious when using input oriented Cross Evaluation models. With the help of an example with one input and one output, the conditions for the possible occurrence of negative efficiencies will be shown. Furthermore, we will show that a small intuitive change in the BCC multipliers model, previously presented in other papers, corrects this situation. We show why this change is used and compared it with an alternative formulation, which avoid negative efficiencies, namely the Non-Decreasing Returns to Scale (NDRS) model. We also show that the formulation studied in this paper is less restrictive than the NDRS model. The study of this variation in the DEA BCC model will be complemented with the formulation of the dual envelope model. This model changes the original frontier. Using the concept of non-observed DMUs, those variations can be graphically analyzed. We have also carried out some algebraic studies concerning benchmarks, multipliers and returns to scale.
653 $aEvaluation model
700 1 $aMEZA, L. A.
700 1 $aSILVEIRA, J. Q. da
700 1 $aGOMES, E. G.
773 $tEUROPEAN JOURNAL OF OPERATIONAL RESEARCH.$gn. 229. 732-737 p. 2013.
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Embrapa Unidades Centrais (AI-SEDE) |
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