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Bayesian shrinkage prediction for the regression problem

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  • Kobayashi, Kei
  • Komaki, Fumiyasu

Abstract

We consider Bayesian shrinkage predictions for the Normal regression problem under the frequentist Kullback-Leibler risk function. Firstly, we consider the multivariate Normal model with an unknown mean and a known covariance. While the unknown mean is fixed, the covariance of future samples can be different from that of training samples. We show that the Bayesian predictive distribution based on the uniform prior is dominated by that based on a class of priors if the prior distributions for the covariance and future covariance matrices are rotation invariant. Then, we consider a class of priors for the mean parameters depending on the future covariance matrix. With such a prior, we can construct a Bayesian predictive distribution dominating that based on the uniform prior. Lastly, applying this result to the prediction of response variables in the Normal linear regression model, we show that there exists a Bayesian predictive distribution dominating that based on the uniform prior. Minimaxity of these Bayesian predictions follows from these results.

Suggested Citation

  • Kobayashi, Kei & Komaki, Fumiyasu, 2008. "Bayesian shrinkage prediction for the regression problem," Journal of Multivariate Analysis, Elsevier, vol. 99(9), pages 1888-1905, October.
  • Handle: RePEc:eee:jmvana:v:99:y:2008:i:9:p:1888-1905
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    References listed on IDEAS

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    1. George, Edward I. & Xu, Xinyi, 2008. "Predictive Density Estimation For Multiple Regression," Econometric Theory, Cambridge University Press, vol. 24(2), pages 528-544, April.
    2. Marriott,Paul & Salmon,Mark (ed.), 2000. "Applications of Differential Geometry to Econometrics," Cambridge Books, Cambridge University Press, number 9780521651165, September.
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    Cited by:

    1. Komaki, Fumiyasu, 2015. "Simultaneous prediction for independent Poisson processes with different durations," Journal of Multivariate Analysis, Elsevier, vol. 141(C), pages 35-48.

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