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A Comparison of Agricultural Sector Models: CRAM, DRAM, SASM and the KVL Model AgEcon
Wiborg, Torben.
Four different programming models dealing with the agricultural sectors in Canada, The Netherlands, Sweden and Denmark are analysed. The purpose is to construct a knowledge base for the development of a new sector model for Danish agriculture. This analysis has created a valuable set of resources for use in the development of the model.
Tipo: Working or Discussion Paper Palavras-chave: Agribusiness.
Ano: 2000 URL: http://purl.umn.edu/24211
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A Relatively Easy-Access Description of the Logistics, Purposes and Function of the Sector Model KRAM AgEcon
Asmild, Mette; Wiborg, Torben.
This working paper describes the design of KRAM; a model of the Danish agricultural sector that has been developed in a research project at KVL between 1997 and 2000. The purpose of this paper is to give a general and non-technical overview of the model. The paper is directed at people who want a more detailed knowledge of the model, but without addressing the underlying formulas and programs. The paper focuses on the logistics of the model. This includes how data are produced and utilized within the model and how the various submodels are designed and work together. Furthermore the calibration and solving procedures and the time aspects of the models are described. Some of these descriptions may appear somewhat interim due to the fact that the model...
Tipo: Working or Discussion Paper Palavras-chave: Agribusiness.
Ano: 1999 URL: http://purl.umn.edu/24197
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Aggregation and Calibration of Agricultural Sector Models Through Crop Mix Restrictions and Marginal Profit Adjustments AgEcon
Wiborg, Torben; McCarl, Bruce A.; Rasmussen, Svend; Schneider, Uwe A..
All agricultural sector models must deal with aggregation and calibration somehow. The aggregation problem involves treating a group of producers as if they all responded in the same way as a single representative unit. The calibration problem concerns making a model reproduce as closely as possible an empirically observed set of decision maker actions. This paper shows how both calibration and aggregation are addressed through crop mix restrictions combined with marginal profit adjust-ments.
Tipo: Conference Paper or Presentation Palavras-chave: Mathematical programming; Aggregation; Calibration; Crop mix; Marginal cost; Agricultural sector model; Agribusiness; C6; C61; Q1; Q11; Q17; Q18; R12; R13; R14.
Ano: 2005 URL: http://purl.umn.edu/24567
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KRAM - A Sector Model of Danish Agriculture - Background and Framework Development AgEcon
Wiborg, Torben.
A model of the Danish agricultural sector named KRAM (KVL's Regionalized Agricultural Model) is developed in this paper. KRAM can be described as a spatial, dynamic, nonlinear, programming sector model. KRAM's purpose is to make policy analysis in the complex market conditions Danish agriculture is working under today. In order to do this in the best possible way the model optimizes the production functions on a very disaggregated level. This allows for analysis of changes in physical constraints to production, as well as price changes. The model is capable of calculating some environmental effects of agricultural production, and provides detailed spatial description of the agricultural economy and production. The time horizon is 10 years, and the model...
Tipo: Working or Discussion Paper Palavras-chave: Agricultural production; Positive mathematical programming; Dynamic agricultural sector model; Regions; Markov chain; Structural development; Crops; Pigs; Cows; GAMS; Production Economics.
Ano: 1998 URL: http://purl.umn.edu/18322
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Service Check on Pig and Cattle Farms - Establish the Visions AgEcon
Andersen, Rasmus; Rasmussen, Heidi Hundrup; Wiborg, Torben.
A service check for a farm is an interesting new way of advising farmers, which has proven very successful. The objective of a service check is to recognise potential improvements in the production using a holistic approach. Often a service check will try to establish the overall goals for the farmer’s family, the farmer and the farm. In order to do so, the farm is systematically analysed in order to establish strengths, weaknesses and possible paths of development. These issues are normally neglected in the day-today contact between the farmer and the usual adviser, and even far-reaching decisions are often taken without a decent analysis of the strategic goals. A service check involves a joint visit, where two experienced advisors visit the farm...
Tipo: Conference Paper or Presentation Palavras-chave: Farm Management.
Ano: 2002 URL: http://purl.umn.edu/7016
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