The Mistreated Model: Some Technical Comments on Porojan's Paper on 'Trade Flows and Spatial Effects'
The paper by Porojan on 'Trade flows and spatial effects' in a recent issue of this journal is criticized on three methodological grounds: it includes two of the gravity model independent variables as relative rather than absolute numbers; the dummy variables included are not binary but interval; and the 'sample' of countries creates a non-normal distribution of inter-country distances, undoubtedly creating heteroscedasticity problems. Because of these three problems, the model is mis-specified, and the results thereby obtained are unreliable. Copyright Kluwer Academic Publishers 2003
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- Jones, Kelvyn & Gould, Myles I. & Duncan, Craig, 2000. "Death and deprivation: an exploratory analysis of deaths in the Health and Lifestyle survey," Social Science & Medicine, Elsevier, vol. 50(7-8), pages 1059-1079, April.
- A. Porojan, 2001. "Trade Flows and Spatial Effects: The Gravity Model Revisited," Open Economies Review, Springer, vol. 12(3), pages 265-280, July.
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