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THE GRAVITY MODEL AND THE PROBLEM OF ZERO’S IN AGRIFOOD TRADE
Gravity model selection bias Agrifood Trade Heckman Selection Model marginal effects
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2014/4/11
In the analysis of bilateral trade flows, reported trade of zero or missing observations are quite common and this is a problem when estimating log-linear gravity equations. This has caused many resea...
DOES THE GRAVITY MODEL SUFFER FROM SELECTION BIAS?
Gravity model selection bias Agrifood Trade Heckman Selection Model marginal effects
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2014/4/11
When analyzing bilateral trade flow data, zero trade flows are quite common and problematic when a gravity equation is estimatedwith a log-linear functional form. This has caused many researchers to e...
Nonlinear Wave–Wave Interactions in a One-Layer Reduced-Gravity Model on the Equatorial β Plane
Nonlinear Wave–Wave Interactions Equatorial β Plane One-Layer Reduced-Gravity Model
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2009/2/7
A one-layer reduced-gravity model in the unbounded equatorial β plane is the simplest way to study nonlinear effects in a tropical ocean. The free evolution of the system is constrained by the existen...
Assimilation of Geosat Altimetric Data in a Nonlinear Reduced-Gravity Model of the Indian Ocean. Part 1：Adjoint Approach and Model-Data Consistency
Geosat Altimetric Data Nonlinear Reduced-Gravity Model Indian Ocean Model-Data Consistency
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2008/12/16
Geosat sea-level variations are assimilated into a nonlinear shallow-water model of the Indian Ocean. After spinup, the model forced by observed winds over 1985–1988 provides a first guess for initial...
Study on the Effects of Bottom Topography on Deep Circulation with a Diffusive Reduced-Gravity Model
Bottom Topography Diffusive Reduced-Gravity Model Deep Circulation
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2008/12/11
Abyssal circulation around a sea mountain and a depression in a midlatitude basin is investigated with a reduced-gravity model characterized by vertical and horizontal diffusion of both momentum and d...
Use of a reduced-gravity model to evaluate present and past primary productivity in the tropical open ocean
a reduced-gravity model past primary productivity tropical open ocean
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2014/6/10
Upwelling predicted by a reduced-gravity model is compared with remotely sensed primary productivity data through the tropical Atlantic and Pacific. The model upper layer thickness, an indicator of ve...