\begin{table}[htbp]\scriptsize\centering\caption{Estimated MSEs \\ ($1,000$ Monte Carlo iterations)}\begin{tabular}{rcccc|cccc|cccccc}\toprule& \multicolumn{1}{r}{} &       & $C = 20$ & \multicolumn{1}{r}{} &       & $C = 50$ &       & \multicolumn{1}{r}{} &       &       & $C = 100$ &       &       &  \\& \multicolumn{1}{r}{} &       & $k$     & \multicolumn{1}{c}{} &       & $k$     &       & \multicolumn{1}{r}{} &       &       & $k$     &       &       &  \\\cmidrule{3-15}    \multicolumn{1}{c}{$\theta$} & \multicolumn{1}{c}{$g_{\iota}$} & 5     & 10    & \multicolumn{1}{c}{20}    & 5     & 10    & 20    & \multicolumn{1}{c}{50}    & 5     & 10    & 20    & 50    & 75    & 100 \\\midrule&$g_3$&1.03&0.54&0.23&1.03&0.54&0.28&0.09&1.11&0.52&0.26&0.11&0.07&0.05\\ \multicolumn{1}{c}{$(1, 0)$} &$g_4$&1.34&1.23&3.13&1.23&0.65&0.45&2.97&1.15&0.59&0.31&0.58&1.89&2.94\\&$g_9$&0.75&0.30&0.12&1.19&0.46&0.16&0.05&1.24&0.61&0.24&0.06&0.04&0.03\\&$g_0$&1.23&0.64&1.22&1.21&0.60&0.29&1.10&1.22&0.61&0.32&0.14&0.55&1.08\\\midrule&$g_3$&1.03&0.54&0.24&1.03&0.54&0.28&0.10&1.11&0.52&0.26&0.11&0.07&0.05\\ \multicolumn{1}{c}{$(1, 0.5)$} &$g_4$&1.42&1.85&5.25&1.26&0.67&0.62&5.04&1.17&0.61&0.33&1.04&3.29&5.02\\&$g_9$&0.76&0.30&0.12&1.19&0.46&0.17&0.05&1.24&0.61&0.24&0.06&0.04&0.03\\&$g_0$&1.25&0.71&1.90&1.22&0.61&0.30&1.75&1.24&0.62&0.32&0.16&0.84&1.73\\\bottomrule\end{tabular}\label{tab:MSE_results_averaging}\end{table}