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Author: David Kaimowitz
Publisher: CIFOR
Keywords: review, deforestation, tropical, models, economic
Number of Pages: 153
Published: 1998
ISBN-10: 979876417X
ISBN-13: 9789798764172

A boom in deforestation modelling. Deforestation. Types of economic deforestation models. Household and firm-level models. Analytical open economy models. Analytical subsistence and chayanovian models. Empirial and simulation models. Spatial simulation models. Spatial regression models. Non-spatial regional regression models. Analytical models. Computable general equilibrium. Trade and commodity models. Multi-country regression models. What drives deforestation?. Priority areas for future research.

Author: Éva E. Plagányi
Publisher: Food & Agriculture Org.
Keywords: fisheries, approach, ecosystem, models
Number of Pages: 128
Published: 2007-10
ISBN-10: 9251057346
ISBN-13: 9789251057346

This report reviews the methods available for assessing the impacts of interactions between species and fisheries and their implications for marine fisheries management. A brief description of the various modelling approaches currently in existence is provided, highlighting in particular features of these models which have general relevance to the field of the ecosystem approach to fisheries (EAF). The report concentrates on the currently available models representative of general types such as bionergetic models, predator-prey models and minimally realistic models. Short descriptions are give

Author: Charles E. McCulloch
Publisher: IMS
Keywords: models, mixed, linear, generalized
Number of Pages: 100
Published: 2003-04-01
ISBN-10: 0940600544
ISBN-13: 9780940600546

Wiley Series in Probability and StatisticsA modern perspective on mixed modelsThe availability of powerful computing methods in recent decades has thrust linear and nonlinear mixed models into the mainstream of statistical application. This volume offers a modern perspective on generalized, linear, and mixed models, presenting a unified and accessible treatment of the newest statistical methods for analyzing correlated, nonnormally distributed data.As a follow-up to Searle's classic, Linear Models, and Variance Components by Searle, Casella, and McCulloch, this new work progresses from the bas

Author: Lance Taylor
Publisher: Oxfam
Keywords: general, equilibrium, models, computable, critique, impact, trade, liberalisation, modelling
Number of Pages: 64
Published: 2007-07
ISBN-10: 0855985852
ISBN-13: 9780855985851

This hard-hitting research report presents a rigorous critique of the most widely used trade models based on computable general equilibrium (or CGE) models. The authors present concise analytical arguments explaining the fundamental weaknesses of typical CGE models. They show that these models tend to make unrealistic assumptions about the macro-economy and do not allow an accurate estimation of the welfare gains that trade liberalisation is supposed to induce. The report appeals for honest simulation strategies showing a variety of possible outcomes, which would enable policy-makers to assess

Author: Nancy R. Kingsbury
Publisher: DIANE Publishing
Keywords: cattle, prices, models, explain, improve, usda, economic
Number of Pages: 176
Published: 2001-02
ISBN-10: 0756733936
ISBN-13: 9780756733933

Reviews economic models, especially treatment of competition, marketing practices, and international trade effects on U.S. cattle prices and producers' incomes. The report addresses 3 questions: To what extent do these models incorporate structural changes -- specifically, market concentration in the meatpacking sector and the use of marketing agreements, forward contracts, and imports?; What are the most important factors that affect cattle prices and producers' incomes?; and What are the most significant data and modeling issues to be considered in developing a more comprehensive model, or l

Author: Smakhtin, Vladimir U., Piyankarage, Sujeewa C., St
Publisher: IWMI
Keywords: conditions, limited, data, ecosystems, coastal, hydrology, small, simulating
Number of Pages: 36
Published: 2004
ISBN-10: 9290905387
ISBN-13: 9789290905387

The impacts of water resources and irrigation development need to be quantified in order to understand the environmental costs of such development activities. Complex data-intensive simulation methods are normally used for this purpose in the developed world. However, lack of reliable data prohibits the use of such models in developing countries where it is more practical to apply models with less data requirements. The report illustrates three applications of simple and pragmatic simulation models to small coastal water bodies in Sri Lanka and South Africa.

Author: SAS Publishing
Publisher: SAS Publishing
Keywords: glimmix, procedure, guide, user, stat, sas
Number of Pages: 261
Published: 2004-04-01
ISBN-10: 1599949547
ISBN-13: 9781599949543

The GLIMMIX procedure fits and analyzes generalized linear mixed models (GLMM), models with random effects for data that can be nonnormally distributed.
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