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"Using panel data models, the author examines the threshold effects of the productivity of infrastructure investment in developing countries. He considers various specifications of an augmented production function that allow for endogenous thresholds. More precisely, these specifications are tested in a panel threshold regression model. The author's main robust result is the presence of strong threshold effects in the relationship between output and private and public inputs. Whatever the transition mechanism used, the testing procedures lead to strong rejection of the linearity of this relationship. In particular, the productivity of infrastructure investment generally exhibits some network effects. When the available stock of infrastructure is very low, investment in this sector has the same productivity as noninfrastructure investment. On the contrary, when a minimum network is available, the marginal productivity of infrastructure investment is generally largely greater than the productivity of other investment. Finally, when the main network is achieved, its marginal productivity becomes similar to the productivity of other investment. "--World Bank web site.
Infrastructure (Economics) --- Production functions (Economic theory) --- Public investments --- Finance.
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"Using panel data models, the author examines the threshold effects of the productivity of infrastructure investment in developing countries. He considers various specifications of an augmented production function that allow for endogenous thresholds. More precisely, these specifications are tested in a panel threshold regression model. The author's main robust result is the presence of strong threshold effects in the relationship between output and private and public inputs. Whatever the transition mechanism used, the testing procedures lead to strong rejection of the linearity of this relationship. In particular, the productivity of infrastructure investment generally exhibits some network effects. When the available stock of infrastructure is very low, investment in this sector has the same productivity as noninfrastructure investment. On the contrary, when a minimum network is available, the marginal productivity of infrastructure investment is generally largely greater than the productivity of other investment. Finally, when the main network is achieved, its marginal productivity becomes similar to the productivity of other investment. "--World Bank web site.
Infrastructure (Economics) --- Production functions (Economic theory) --- Public investments --- Finance.
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Économétrie. --- Probabilités. --- Statistique.
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Comment synthétiser et interpréter l'information contenue dans des données économiques et financières ? Comment analyser et quantifier la relation entre plusieurs séries ? Qu'est-ce qu'une loi de probabilité ? Comment estimer un modèle et mettre en œuvre des tests statistiques ? Alliant théorie et pratique, ce manuel met l'accent sur l'acquisition des méthodes et des compétences indispensables à tout étudiant pour réussir sa licence. Il propose : des situations concrètes pour introduire les concepts ; un cours visuel et illustré par de nombreux exemples pour acquérir les connaissances fondamentales en statistique et probabilités ; des conseils méthodologiques et des interviews pour traduire la théorie en pratique et montrer comment la statistique est utilisée par les professionnels ; des éclairages sur les grands auteurs de la discipline ; des exercices progressifs et variés (QCM, problèmes, sujets d'examen) pour s'évaluer et s'entraîner. Les corrigés détaillés des exercices, les tables statistiques et des approfondissements sont accessibles sur www.dunod.com.
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