Abstract
In this paper, we consider a commonly used partially linear model. We proposed a restricted difference-based ridge estimator for the vector of parameters β in a partially linear model with one smoothing term when additional linear restrictions on the parameter vector are assumed to hold. The ideas in the paper are illustrated in a real data set and in a Monte Carlo simulation study.
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Acknowledgements
The author is grateful to the editor and the referee for valuable comments which improved an earlier draft of this article.