Jörnsten, Kurt; Kleppe, Gisle; Thorsen, Inge; Ubøe, Jan - Institutt for foretaksøkonomi, Norges Handelshøyskole … - 2007
In this paper we propose a modified gravity model that takes into account that a population generally consists of heterogeneous groups, and we suggest a new statistical test for heterogeneity. We apply our new model to two real world data sets, and it turns out that this new model fits the data...
