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Adopción de tecnología de distribución y control del agua en las Comunidades de Regantes de la Región de Murcia AgEcon
Alcon, Francisco; De Miguel, María Dolores; Burton, Michael P..
RESUMEN: En el presente trabajo se estudia el proceso de adopción de tecnología de distribución y control de agua que las Comunidades de Regantes de la Región de Murcia han llevado a cabo desde el año 1975 hasta 2005. Se analiza el tiempo que transcurre desde que se constituye la Comunidad de Regantes hasta que toma la decisión de adoptar utilizando Análisis de Duración. Se identifican como aceleradores del proceso de adopción la posesión de un pozo de apoyo, el empleo de un sistema tarifario variable en función del consumo, los efectos de las políticas de subvenciones a las obras de modernización y mejora de los regadíos y las sequías. SUMMARY: The present paper analyses the process of adopting water management and control technology in the irrigation...
Tipo: Journal Article Palavras-chave: Análisis de duración; Comunidad de regantes; Función de riesgo; Tecnología de riego; Irrigation community; Hazard function; Irrigation technology; Duration analysis; Agribusiness; Research and Development/Tech Change/Emerging Technologies; Q16; Q25; D71.
Ano: 2008 URL: http://purl.umn.edu/37190
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Flexible parametric alternatives to the Cox model, and more AgEcon
Royston, Patrick.
Since its introduction to a wondering public in 1972, the Cox proportional hazards regression model has become an overwhelmingly popular tool in the analysis of censored survival data. However, some features of the Cox model may cause problems for the analyst or an interpreter of the data. They include the restrictive assumption of proportional hazards for covariate effects, and “loss” (non-estimation) of the baseline hazard function induced by conditioning on event times. In medicine, the hazard function is often of fundamental interest since it represents an important aspect of the time course of the disease in question. In the present article, the Stata implementation of a class of flexible parametric survival models recently proposed by Royston and...
Tipo: Journal Article Palavras-chave: Parametric survival analysis; Hazard function; Proportional hazards; Proportional odds; Research Methods/ Statistical Methods.
Ano: 2001 URL: http://purl.umn.edu/115931
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Induced-Innovation and Invasive Species Management AgEcon
Kim, C.S.; Schaible, Glenn D.; Lewandrowski, Jan.
Public policy for managing invasive species has largely focused on preventive measures prior to detection (stage 1) and on the use of chemical/mechanical or biological control measures after the establishment and dispersion of the invasive species (stage 2). Optimal management policy depends both on the initial stock of the invasive species and on the costs associated with conventional control measures. However, little attention has focused on how an induced technology such as Bt corn and Bt cotton is developed and adopted by farmers (stage 3), or how it affects the manageability of economic and ecological damages from an invasive species. This analysis evaluates the optimal allocation of management resources between preventive and control measures for...
Tipo: Conference Paper or Presentation Palavras-chave: Invasive species; Preventive measures; Control measures; Induced technology; Hazard function; Optimal control; Comparative dynamic analysis; Environmental Economics and Policy; Production Economics.
Ano: 2010 URL: http://purl.umn.edu/60985
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Permanence of Carbon Sequestered in Forests under Uncertainty AgEcon
Kim, C.S.; Lewandrowski, Jan; Sands, Ronald D.; Johansson, Robert C..
In this paper we examine the issue of permanence in the context of sequestering carbon through afforestation. We develop a dynamic nested optimal control model of carbon sequestration associated with the decision to afforest a tract of land given there are uncertainties associated with fire and insect/disease hazards. Conceptually, these potential hazards are similar in that their occurrence at any time t is uncertain and landowners can take specific actions – although generally different actions - in any time period t to reduce the probability of sustaining losses related to them. The hazards differ, however, in that fire represents a large loss in carbon at a moment in time, while insect/disease infestations are more likely to be reflected in a period...
Tipo: Conference Paper or Presentation Palavras-chave: Carbon sequestration; Uncertainty; Optimal control; Hazard function; Forestry; Permanence; Environmental Economics and Policy; Land Economics/Use.
Ano: 2011 URL: http://purl.umn.edu/103565
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