搜索结果: 1-1 共查到“世界经济学 gravity model”相关记录1条 . 查询时间(0.078 秒)
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...