The relative efficiency of Liu-type estimator in a partially linear model

In this paper, we study the partially linear model, y=Xβ+f+εy=Xβ+f+ε. We introduce a new Liu-type estimator in a partially linear model, then we compared the new estimator with the two-step estimator in the mean squared error sense. Finally, we give a simulation study to explain the validity and feasibility of the approach.