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Variable selection and functional form uncertainty in cross-country growth regressions

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  • Salimans, Tim
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    Abstract

    Regression analyses of cross-country economic growth data are complicated by two main forms of model uncertainty: the uncertainty in selecting explanatory variables and the uncertainty in specifying the functional form of the regression function. Most discussions in the literature address these problems independently, yet a joint treatment is essential. We present a new framework that makes such a joint treatment possible, using flexible nonlinear models specified by Gaussian process priors and addressing the variable selection problem by means of Bayesian model averaging. Using this framework, we extend the linear model to allow for parameter heterogeneity of the type suggested by new growth theory, while taking into account the uncertainty in selecting explanatory variables. Controlling for variable selection uncertainty, we confirm the evidence in favor of parameter heterogeneity presented in several earlier studies. However, controlling for functional form uncertainty, we find that the effects of many of the explanatory variables identified in the literature are not robust across countries and variable selections.

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    Bibliographic Info

    Article provided by Elsevier in its journal Journal of Econometrics.

    Volume (Year): 171 (2012)
    Issue (Month): 2 ()
    Pages: 267-280

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    Handle: RePEc:eee:econom:v:171:y:2012:i:2:p:267-280

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    Web page: http://www.elsevier.com/locate/jeconom

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    Keywords: Growth regression; Variable selection; Model uncertainty; Model averaging; Semi-parametric Bayes; Gaussian process prior; MCMC;

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