Bayesian Inference for a Normal Dispersion Matrix and its Application to Stochastic Multiple Regression Analysis
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Summary This paper discusses Bayesian inference procedures for a normal dispersion matrix. Structural information for the prior mean of the dispersion matrix is incorporated into the analysis through a Normal-Wishart prior distribution. Many of the resulting Bayes estimates are invariant, consistent and asymptotically efficient. Using this procedure, a coherent Bayesian argument for stochastic multiple regression analysis is developed, where dependent and independent variables are jointly random, without experimental control. It is shown that ordinary least squares, a general form of ridge regression, and factor analysis regression methods can be represented as special cases within this general framework. The preliminary report of a simulation study indicates that the Bayesian regression techniques demonstrate substantial improvements over least squares, even using frequentist criteria. Finally, the related problem of joint estimation of the normal population mean and dispersion matrix is briefly discussed in Section 5. The resulting Bayes estimate for the population mean is shown to be closely related to Stein estimates.