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| Registros recuperados: 16 | |
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| Whitacre, Brian E.. |
| This paper examines the shifting influence of household characteristics and telecommunications infrastructure on the residential broadband adoption decision for Oklahoma residents between 2003 and 2006. In particular, the spread of wired telecommunications infrastructure (namely cable Internet and Digital Subscriber Lines (DSL)) is examined, along with the effect that this diffusion has had on broadband access rates. The data indicates that the gap in broadband access rates between rural and urban areas has remained relatively constant over this period despite increased levels of cable and DSL throughout the state. In addition, an inter-temporal decomposition shows that the increasing levels of infrastructure are not the dominant cause of higher broadband... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Broadband; Internet; Temporal Diffusion; Public Economics; Research and Development/Tech Change/Emerging Technologies; R11; O18; C1. |
| Ano: 2008 |
URL: http://purl.umn.edu/6934 |
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| Whitacre, Brian E.. |
| Rural communities suffer from both supply and demand-side disadvantages when dealing with Internet access. Telecommunications companies are less likely to provide them with needed infrastructure due to lower population densities, and they also tend to have lower levels of specific factors known to influence the access decision such as education and income. This study looks at the broadband Internet setting in Oklahoma over a 3-year period, examining the diffusion of both infrastructure and access rates. A non-linear decomposition technique allows for measurement of how specific characteristics, including the availability of infrastructure, contribute to observed metropolitan – micropolitan or metropolitan – noncore “digital divides.” The results... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Broadband; Internet; Diffusion; Rural; Community/Rural/Urban Development; R11; O18; C1. |
| Ano: 2009 |
URL: http://purl.umn.edu/55929 |
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| Awokuse, Titus O.; Bessler, David A.. |
| The paper considers the use of directed acyclic graphs (DAGs), and their construction from observational data with PC-algorithm TETRAD II, in providing over-identifying restrictions on the innovations from a vector autoregression. Results from Sims’ 1986 model of the US economy are replicated and compared using these data-driven techniques. The directed graph results show Sims’ six-variable VAR is not rich enough to provide an unambiguous ordering at usual levels of statistical significance. A significance level in the neighborhood of 30 % is required to find a clear structural ordering. Although the DAG results are in agreement with Sims’ theory-based model for unemployment, differences are noted for the other five variables: income, money supply, price... |
| Tipo: Journal Article |
Palavras-chave: Vector autoregression; Directed graphs; Policy analysis; Research Methods/ Statistical Methods; C1; E1. |
| Ano: 2003 |
URL: http://purl.umn.edu/44001 |
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| Bazilian, Morgan; Nussbaumer, Patrick; Rogner, Hans-Holger; Brew-Hammond, Abeeku; Foster, Vivien; Kammen, Daniel M.; Pachauri, Shonali; Eric, Williams; Howells, Mark; Niyongabo, Philippe; Musaba, Lawrence; O Gallachoir, Brian; Radka, Mark. |
| In order to reach a goal of universal access to modern energy services in Africa by 2030, consideration of various electricity sector pathways is required to help inform policy-makers and investors, and help guide power system design. To that end, and building on existing tools and analysis, we present several ‘high-level’, transparent, and economy-wide scenarios for the sub-Saharan African power sector to 2030. We construct these simple scenarios against the backdrop of historical trends and various interpretations of universal access. They are designed to provide the international community with an indication of the overall scale of the effort required. We find that most existing projections, using typical long-term forecasting methods for power... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Energy Access; Power System Planning; Sub-Saharan Africa; Resource /Energy Economics and Policy; C1; Q41; Q47. |
| Ano: 2011 |
URL: http://purl.umn.edu/116904 |
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| Musshoff, Oliver; Hirschauer, Norbert. |
| Agricultural production relies to a great extent on biological processes in natural environments. In addition to volatile prices, it is thus heavily exposed to risks caused by the variability of natural conditions such as rainfall, temperature and pests. With a view to the apparently lacking support of risky farm production program decisions through formal planning models, the objective of this paper is to examine whether, and eventually by how much, farmers’ “intuitive” program decisions can be improved through formal statistical analyses and stochastic optimization models. In this performance comparison, we use the results of the formal planning approach that are generated in a quasi ex-ante analysis as a normative benchmark for the empirically observed... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Stochastic optimization; Stochastic processes; Production risk; Program planning; Time series analysis; C1; C61; M11; Q12. |
| Ano: 2008 |
URL: http://purl.umn.edu/36865 |
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| Pennings, Joost M.E.; Garcia, Philip; Irwin, Scott H.. |
| Heterogeneity, i.e., the notion that individuals respond differently to economic stimuli, can have profound consequences for the interpretation of behavior and the formulation of agricultural policy. This paper compares and evaluates three grouping techniques that can be used to account for heterogeneity in financial behavior. Two are well established: company-type grouping and cluster analysis. A third, the generalized mixture regression model, has recently been developed and is worth considering as market participants are grouped such that their response to the determinants of economic behavior is similar. We evaluate the grouping methods in a hedging framework by assessing their ability to reflect relationships consistent with theory. The empirical... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Economic behavior; Heterogeneity; Hedging; Methods; Risk and Uncertainty; A10; B40; C1; D0; G0; L2; Q13. |
| Ano: 2011 |
URL: http://purl.umn.edu/114787 |
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| Weber, Sascha A.; Salamon, Petra; Hansen, Heiko. |
| Since the stepwise reduction of intervention prices combined with watered down conditions and suspended export refunds, respectively, the EU dairy industry faces new challenges regarding wild price fluctuations originally caused in third countries. In the past, the EU domestic market was insulated as far as possible from world markets. However, today global prices could affect prices even at the level of consumers, but more directly at the level milk producers. Volatility noticeable increased with the price peak in 2007, followed by the drop in 2008, and a new price boost in 2010. Additionally, reduced security in marketing of butter and skimmed milk powder led to higher processing share of cheese which is not only exported but also increasingly consumed... |
| Tipo: Presentation |
Palavras-chave: Price transmission; Cointegration; Granger-causality; Dairy; Risk and Uncertainty; C1; E3; E6; F3; Q1. |
| Ano: 2012 |
URL: http://purl.umn.edu/122542 |
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| Hahn, Jinyong; Hirano, Keisuke; Karlan, Dean S.. |
| Many social experiments are run in multiple waves, or are replications of earlier social experiments. In principle, the sampling design can be modified in later stages or replications to allow for more efficient estimation of causal effects. We consider the design of a two-stage experiment for estimating an average treatment effect, when covariate information is available for experimental subjects. We use data from the first stage to choose a conditional treatment assignment rule for units in the second stage of the experiment. This amounts to choosing the propensity score, the conditional probability of treatment given covariates. We propose to select the propensity score to minimize the asymptotic variance bound for estimating the average treatment... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Experimental design; Propensity score; Efficiency bound; Research Methods/ Statistical Methods; C1; C14; C9; C93; C13. |
| Ano: 2009 |
URL: http://purl.umn.edu/47107 |
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| Registros recuperados: 16 | |
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