In this paper, we introduce a generalized Liu estimator and jackknifed Liu estimator in a linear regression model with correlated or heteroscedastic errors. Therefore, we extend the Liu estimator. Under the mean square error(MSE), the jackknifed estimator is superior to the Liu estimator and the jackknifed ridge estimator. We also give a method to select the biasing parameter for d. Furthermore, a numerical example is given to illustvate these theoretical results.
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机译:Expert’s Comment concerning Grand Rounds case entitled Aggressive vertebral hemangioma of the thoracic spine without typical radiological appearance (Lei Dang Chen Liu Shao Min Yang Liang Jiang Zhong Jun Liu Xiao Guang Liu Hui Shu Yuan Feng Wei Miao Yu)