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Between-Group Dependence in PPP Equations and its Causes: A Principal Components Approach


  • Jerry Coakley, Ana-Maria Fuertes, Ron Smith


Principal components of the residuals are proposed for analysing between-group dependence when estimating PPP equations in large-T, large-N panels. If this dependence arises because omitted variables are correlated with included variables, the appropriate response to between-group dependences may not be GLS. Instead estimating the factors that account for the covariances between groups may help to suggest relevant omitted variables that can be included in the model. The approach is applied to four PPP panels of 17 OECD countries for the 1973:1-1998:12 period.

Suggested Citation

  • Jerry Coakley, Ana-Maria Fuertes, Ron Smith, 2001. "Between-Group Dependence in PPP Equations and its Causes: A Principal Components Approach," Computing in Economics and Finance 2001 140, Society for Computational Economics.
  • Handle: RePEc:sce:scecf1:140

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    References listed on IDEAS

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    More about this item


    Principal components; omitted variables; cross-sectional dependence; GLS;

    JEL classification:

    • C23 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Models with Panel Data; Spatio-temporal Models
    • F31 - International Economics - - International Finance - - - Foreign Exchange


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