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The "Pathology" Of The Natural Conjugate Prior Density In The Regression Model

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  • BAUWENS, L.

Abstract

In a Bayesian analysis of the linear regression model, one may have prior information on a subset of the regression coefficients, but one has usually no prior information on the error variance. If one incorporates this kind of information in a naturel conjugate prior density, under certain conditions the posterior mean of the coefficients on which one is informative is equal to the prior mean, and the posterior mean of the coefficients on which one is not informative is equal to a constrained least squares estimator. The value of the posterior covariance matrix is also studied. We discuss and illustrate how to avoid getting posterior results too close to the "pathological" results summarized above.
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Suggested Citation

  • Bauwens, L., 1990. "The "Pathology" Of The Natural Conjugate Prior Density In The Regression Model," G.R.E.Q.A.M. 90a14, Universite Aix-Marseille III.
    • Handle: RePEc:fth:aixmeq:90a14
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    Cited by:

    1. Koop, Gary & Poirier, Dale J., 2004. "Bayesian variants of some classical semiparametric regression techniques," Journal of Econometrics, Elsevier, vol. 123(2), pages 259-282, December.
    2. Fernandez, Carmen & Ley, Eduardo & Steel, Mark F. J., 2001. "Benchmark priors for Bayesian model averaging," Journal of Econometrics, Elsevier, vol. 100(2), pages 381-427, February.
    3. Nalan Basturk & Cem Cakmakli & S. Pinar Ceyhan & Herman K. van Dijk, 2014. "On the Rise of Bayesian Econometrics after Cowles Foundation Monographs 10, 14," Tinbergen Institute Discussion Papers 14-085/III, Tinbergen Institute, revised 04 Sep 2014.

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