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The Mistreated Model: Some Technical Comments on Porojan's Paper on 'Trade Flows and Spatial Effects'


  • Ron Johnston
  • Les Hepple
  • Tony Hoare
  • Kelvyn Jones
  • Paul Plummer


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

Suggested Citation

  • Ron Johnston & Les Hepple & Tony Hoare & Kelvyn Jones & Paul Plummer, 2003. "The Mistreated Model: Some Technical Comments on Porojan's Paper on 'Trade Flows and Spatial Effects'," Open Economies Review, Springer, vol. 14(1), pages 11-14, January.
  • Handle: RePEc:kap:openec:v:14:y:2003:i:1:p:11-14
    DOI: 10.1023/A:1021282731314

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    References listed on IDEAS

    1. A. Porojan, 2001. "Trade Flows and Spatial Effects: The Gravity Model Revisited," Open Economies Review, Springer, vol. 12(3), pages 265-280, July.
    2. 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.
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    Cited by:

    1. Anca Carrington, 2003. "The Mistreated Model: A Reply," Open Economies Review, Springer, vol. 14(1), pages 15-17, January.
    2. Rodolfo Metulini & Paolo Sgrignoli & Stefano Schiavo & Massimo Riccaboni, 2014. "The migration network effect on international trade," Working Papers 5/2014, IMT Institute for Advanced Studies Lucca, revised May 2014.
    3. Thomas Vanoutrive, 2011. "Modelling the link between port throughput and economic activity," ERSA conference papers ersa10p881, European Regional Science Association.

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    trade; gravity model; mis-specification;


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