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MSE results of order-α, isotonic CQR, and isotonic CER with n = 1000.

MSE results of order-α, isotonic CQR, and isotonic CER with n = 1000.

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Quantile regression and partial frontier are two distinct approaches to nonparametric quantile frontier estimation. In this article, we demonstrate that partial frontiers are not quantiles. Both convex and nonconvex technologies are considered. To this end, we propose convexified order-$\alpha$ as an alternative to convex quantile regression (CQR)...

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Context 1
... consider the choice of quantiles τ . Figure 3 depicts the MSE results in estimating the quantile functions for different input dimensions and SNR specifications, while keeping the sample size fixed at n = 1000. In all scenarios considered, isotonic CQR and isotonic CER have far smaller MSE values than order-α. ...
Context 2
... Figures 3 and 5, we notice that the MSE statistic for each estimator decreases to a great extent once imposing the concavity constraint, especially for order-α. For instance, in the one-input case with σ = 1.88, the average MSE of convexified order-α for the five estimated quantiles decreases by more than 160% compared to its original counterpart. ...