题目:On the Specification of the Gravity Model of Trade: Zeros, Excess Zeros and Zero-inflated Estimation
作者:Martijn Burger, Frank van Oort & Gert-Jan Linders
期刊:Spatial Economic Analysis, Volume 4, Issue 2, 2009. pages 167-190
链接:
http://www.tandfonline.com/doi/pdf/10.1080/17421770902834327