Fig. 2. Risk comparison between the estimators of Longford and Shen. [Upper] Difference in the Relative mean squared error (RMSE) R(θ̂Lf, θ) − R(θ̂Shen, θ). [Lower] Ratio of the RMSE, R(θ̂Lf, θ)/R(θ̂Shen, θ).
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