Bayes and Empirical Bayes Estimators with Their Unique Simpler Forms and Their Superiorities over BLUE in Two Seemingly Unrelated Regressions
This paper considers Bayes and empirical Bayes estimation of the regression parameters in a system of two seemingly unrelated regression (SUR) models with Gaussian disturbances. Employing the covariance-adjusted technique, we obtain a sequence of Bayes estimators and show that this is the best Bayes estimator (BE) in the sense of having least covariance matrix. We establish the superiority of this best BE over the best linear unbiased estimator (BLUE) in terms of the mean square error matrix (MSEM) criterion. When the covariance matrix of disturbances is unknown, we obtain a sequence of corresponding empirical Bayes (EB) estimators and show that this too is superior to BLUE in MSEM criterion. In addition, we establish an interesting fact which shows that both Bayes and empirical Bayes estimators have only unique simpler forms, which too are superior to BLUE, and further allow us to study them in more details. This paper shows that the proposed Bayes and EB estimators, which combine the Bayesian method with the covariance-adjusted technique, are very efficient even for small sample size. Finally, we generalize our results to the system of two SURs with unequal numbers of observations and to the system of more than two SURs.
Volume (Year): 9 (2011)
Issue (Month): 2 (July)
|Contact details of provider:|| Web page: http://www.jqe.co.in/societyhome.html|
More information through EDIRC
|Order Information:|| Postal: Managing Editor, Journal of Quantitative Economics, Indira Gandhi Institute of Development Research (IGIDR), Gen. A.K. Vaidya Marg, Goregaon (E), Mumbai 400 065 , INDIA|
References listed on IDEAS
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
- Schmidt, Peter, 1977. "Estimation of seemingly unrelated regressions with unequal numbers of observations," Journal of Econometrics, Elsevier, vol. 5(3), pages 365-377, May.
- Swamy, P. A. V. B. & Mehta, J. S., 1975. "On Bayesian estimation of seemingly unrelated regressions when some observations are missing," Journal of Econometrics, Elsevier, vol. 3(2), pages 157-169, May.
When requesting a correction, please mention this item's handle: RePEc:jqe:jqenew:v:9:y:2011:i:2:p:88-103. See general information about how to correct material in RePEc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (D. M. Nachane)or ()
If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.
If references are entirely missing, you can add them using this form.
If the full references list an item that is present in RePEc, but the system did not link to it, you can help with this form.
If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your profile, as there may be some citations waiting for confirmation.
Please note that corrections may take a couple of weeks to filter through the various RePEc services.