Abstract
A set of multiple regression models whose error terms have possibly contemporaneous correlations is called a seemingly unrelated regression model. In this paper, a best equivariant estimator of the regression vector under risk matrix is established in a seemingly unrelated regression model. It should be noted that an estimator optimal with respect to risk matrix remains optimal under a broad range of quadratic loss functions. A generalized least squares expression of our estimator is also presented.
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Acknowledgements
The authors would like to thank anonymous reviewers for many constructive and useful comments. Matsuura’s portion of this work is supported by JSPS KAKENHI Grant Number 20K11713. Kurata’s portion of this work is supported by JSPS KAKENHI Grant Number 19K11853.
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Matsuura, S., Kurata, H. Optimal estimator under risk matrix in a seemingly unrelated regression model and its generalized least squares expression. Stat Papers 63, 123–141 (2022). https://doi.org/10.1007/s00362-021-01232-5
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DOI: https://doi.org/10.1007/s00362-021-01232-5
Keywords
- Elliptically symmetric distribution
- Equivariant estimator
- Generalized least squares
- Risk matrix
- Seemingly unrelated regression model