Least upper bound for the covariance matrix of a generalized least squares estimator in regression with applications to a seemingly unrelated regression model and a heteroscedastic model
1999 ◽
Vol 70
(1)
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pp. 86-94
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1991 ◽
Vol 20
(4)
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pp. 919-925
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2004 ◽
Vol 34
(1)
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pp. 37-54
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