Asymptotic properties for combined L₁ and concave regularization

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Two important goals of high-dimensional modeling are prediction and variable selection. In this article, we consider regularization with combined L₁ and concave penalties, and study the sampling properties of the global optimum of the suggested method in ultra-high dimensional settings. The L₁-penalty provides the minimum regularization needed for removing noise variables in order to achieve oracle prediction risk, while concave penalty imposes additional regularization to control model sparsity. In the linear model setting, we prove that the global optimum of our method enjoys the same oracle inequalities as the lasso estimator and admits an explicit bound on the false sign rate, which can be asymptotically vanishing. Moreover, we establish oracle risk inequalities for the method and the sampling properties of computable solutions. Numerical studies suggest that our method yields more stable estimates than using a concave penalty alone.