Difference based ridge and Liu type estimators in semiparametric regression models

Esra Akdeniz Duran, Wolfgang Härdle and Maria Osipenko

No 2011-014, SFB 649 Discussion Papers from Humboldt University Berlin, Collaborative Research Center 649: Economic Risk

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 = Xb + f + e. Both estimators are analysed 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.

Keywords: difference based estimator; differencing estimator; differencing matrix; Liu estimator; Liu type estimator; multicollinearity; ridge regression estimator; semiparametric model (search for similar items in EconPapers)
JEL-codes: C14 C51 (search for similar items in EconPapers)
Date: 2011
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Journal Article: Difference based ridge and Liu type estimators in semiparametric regression models (2012)
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