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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
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
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...