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The Effects of Model Specification on Foreign Direct Investment Models: An Application of Count Data Models

  • KaSaundra M. Tomlin
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    Previous studies have drawn a theoretical and empirical connection between foreign direct investment (FDI) and exchange rates using continuous measures of FDI. However, FDI data are often in discrete count form. I take a representative study of the FDI/exchange rate relationship by Jose M. Campa (1993), and I analyze the sensitivity of the results to specification of the dependent variable. Whereas Campa uses a Tobit specification, I use a count data specification to model counts of FDI occurrences. Using data on FDI in the United States from 1982 to 1993, controlling for the traditional determinants of FDI, I find that the results are sensitive across specifications. Significance levels and the magnitude of the coefficients change when going from a continuous Tobit specification to a zero inflated Poisson (ZIP) model designed for count data. Formal statistical testing finds that the ZIP specification likely models the data most properly. Thus, I indicate that misspecification bias from modeling discrete data with continuous distributions is important.

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    Article provided by Southern Economic Association in its journal Southern Economic Journal.

    Volume (Year): 67 (2000)
    Issue (Month): 2 (July)
    Pages: 460-468

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    Handle: RePEc:sej:ancoec:v:67:2:y:2000:p:460-468
    Contact details of provider: Web page: http://www.southerneconomic.org/

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