Difference based ridge and Liu type estimators in semiparametric regression models |
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Authors: | Esra Akdeniz Duran,Wolfgang Karl Hä rdleMaria Osipenko |
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Affiliation: | a Department of Statistics, Gazi University, Turkeyb Center for Applied Statistics & Economics, Humboldt-Universität zu Berlin, Germanyc CASE, School of Business and Economics, Humboldt-Universiät zu Berlin, Unter den Linden 6, 10099, Germany |
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Abstract: | We consider a difference based ridge regression estimator and a Liu type estimator of the regression parameters in the partial linear semiparametric regression model, y=Xβ+f+ε. Both estimators are analyzed and compared in the sense of mean-squared error. We consider the case of independent errors with equal variance and give conditions under which the proposed estimators are superior to the unbiased difference based estimation technique. We extend the results to account for heteroscedasticity and autocovariance in the error terms. Finally, we illustrate the performance of these estimators with an application to the determinants of electricity consumption in Germany. |
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Keywords: | 62G08 62J07 |
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