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The Information Technology Revolution and Higher Education AgEcon
Nelson, Gerald C..
Higher education is under pressure from state legislatures and other clients to reduce costs. Two information technologies - increased computing power on the desktop and the World Wide Web - have shifted out the meta production function for instruction in higher education. The theory of induced innovation provides hypotheses about the kinds of educational practices that will attract technological change. Several sources of inefficiency in higher education are identified and likely technology-driven changes suggested. These innovations will provide the means to reduce costs in higher education.
Tipo: Journal Article Palavras-chave: Induced innovation; Learning technologies; World Wide Web; Agribusiness; Teaching/Communication/Extension/Profession.
Ano: 1996 URL: http://purl.umn.edu/90399
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Assessing the Robustness of Predictions in Spatially Explicit Models of Land Use AgEcon
De Pinto, Alessandro; Nelson, Gerald C..
We propose an information-theoretic approach to assess the performance of a discrete choice model used to analyze land use and land use change. We show that our disaggregated measure can be used to compare robustness of predictions across land use categories and across models. Furthermore, a proper reformulation of the problem shows that a disaggregated (observation by observation) log-likelihood lends itself to an information theoretic interpretation, which allows comparisons performance across models.
Tipo: Conference Paper or Presentation Palavras-chave: Land Economics/Use.
Ano: 2006 URL: http://purl.umn.edu/21307
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A DYNAMIC MODEL OF LAND USE CHANGE WITH SPATIALLY EXPLICIT DATA AgEcon
De Pinto, Alessandro; Nelson, Gerald C..
A discrete choice dynamic model was used to predict land use change for an area in Panama. Our results show not only that our modeling technique performs better than static models, but it is also superior to previous attempts to model land use change in a dynamic fashion.
Tipo: Conference Paper or Presentation Palavras-chave: Land Economics/Use.
Ano: 2004 URL: http://purl.umn.edu/20314
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CORRECTING FOR SPATIAL EFFECTS IN LIMITED DEPENDENT VARIABLE REGRESSION: ASSESSING THE VALUE OF "AD-HOC" TECHNIQUES AgEcon
De Pinto, Alessandro; Nelson, Gerald C..
A common test for spatial dependence in regression analysis with continuous dependent variables is the Moran’'s I. For limited dependent variable models, the standard definition of a residual breaks down because yi is qualitative. Efforts to correct for potential spatial effects in limited dependent variable models have relied on ad-hoc methods such as including a spatial lag variable or using a regular sample that omits neighboring observations. Kelejian and Prucha have recently developed a version of Moran’'s I for limited dependent variable models. We present the statistic in a more accessible way and use it to test the value of previously-used ad-hoc techniques with a specific data set. Keywords: Moran’s I, Spatial Autocorrelation, Limited Dependent...
Tipo: Conference Paper or Presentation Palavras-chave: Moran’'s I; Spatial Autocorrelation; Limited Dependent Variable Models; Land-Use Change; Geographical Information Systems (GIS); Research Methods/ Statistical Methods.
Ano: 2002 URL: http://purl.umn.edu/19782
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AN ASSESSMENT OF WORKAROUNDS FOR SPATIAL EFFECTS IN THE CASE OF BINARY PROBIT AgEcon
Robertson, Richard D.; Nelson, Gerald C..
The consequences of spatial effects on discrete choice models have not been well established. Various ad hoc workarounds have been proposed to mitigate potential estimation problems. This paper employs Monte Carlo simulation to investigate the severity of the problems introduced by spatial effects and the effectiveness of the workarounds.
Tipo: Conference Paper or Presentation Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004 URL: http://purl.umn.edu/20234
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Modeling Deforestation and Land Use Change: Sparse Data Environments AgEcon
De Pinto, Alessandro; Nelson, Gerald C..
Land use change in developing countries is of great interest to policymakers and researchers from many backgrounds. Concerns about consequences of deforestation for global climate change and biodiversity have received the most publicity, but loss of wetlands, declining land productivity, and watershed management are also problems facing developing countries. In developing countries, analysis is especially constrained by lack of data. This paper reviews modeling approaches for data-constrained environments that involve methods such as neural nets and dynamic programming and research results that link individual household survey data with satellite images using geographic positioning systems.
Tipo: Conference Paper or Presentation Palavras-chave: Land Economics/Use; Q15; Q23; R14.
Ano: 2006 URL: http://purl.umn.edu/25723
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Climate change: Impact on agriculture and costs of adaptation AgEcon
Nelson, Gerald C.; Rosegrant, Mark W.; Koo, Jawoo; Robertson, Richard D.; Sulser, Timothy B.; Zhu, Tingju; Ringler, Claudia; Msangi, Siwa; Palazzo, Amanada; Batka, Miroslav; Magalhaes, Marilia Castelo; Valmonte-Santos, Rowena A.; Ewing, Mandy; Lee, David R..
Tipo: Report Palavras-chave: Environmental Economics and Policy; Farm Management.
Ano: 2009 URL: http://purl.umn.edu/57371
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What is the irrigation potential for Africa? A Combined Biophysical and Socioeconomic Approach AgEcon
You, Liangzhi; Ringler, Claudia; Nelson, Gerald C.; Wood-Sichra, Ulrike; Robertson, Richard D.; Wood, Stanley; Guo, Zhe; Zhu, Tingju; Sun, Yan.
Although irrigation in Africa has the potential to boost agricultural productivities by at least 50 percent, food production on the continent is almost entirely rainfed. The area equipped for irrigation, currently slightly more than 13 million hectares, makes up just 6 percent of the total cultivated area. Eighty-five percent of Africa’s poor live in rural areas and mostly depend on agriculture for their livelihoods. As a result, agricultural development is key to ending poverty on the continent. Many development organizations have recently proposed to significantly increase investments in irrigation in the region. However, the potential for irrigation investments in Africa is highly dependent upon geographic, hydrologic, agronomic, and economic factors...
Tipo: Working or Discussion Paper Palavras-chave: Irrigation potential; Internal rate of return; Large-scale irrigation; Small-scale irrigation; Investment; Africa; International Development; Resource /Energy Economics and Policy.
Ano: 2010 URL: http://purl.umn.edu/93736
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IS A BEEF DEFICIENCY PAYMENT PARETO-SUPERIOR IN SOUTH KOREA? AgEcon
Nelson, Gerald C.; Lee, Yong-Kee.
South Korea uses a quota and a tariff on beef imports to keep farm prices high. Part of the quota rents are used to support indirect benefits to producers. The welfare costs of these policies are analyzed. Following a suggestion of Hayami, a deficiency payment financed by tariff revenues from increased imports is considered as an alternative to the quota. As Anderson (1983) found for Japan, a deficiency payment is Pareto-superior only if indirect benefits from the quota revenue are ignored.
Tipo: Journal Article Palavras-chave: International Relations/Trade.
Ano: 1991 URL: http://purl.umn.edu/32622
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