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1\begin{table}[htbp]2\centering\scriptsize3\caption{Simulation — MAE of 3-month index-change forecasts relative to the no-change forecast at the region level, by scenario (Monte Carlo s.e. over replications)}\label{tab:sim_region}4\begin{threeparttable}5\begin{tabular}{lrrrrr}6\toprule7Model & rw & momentum & regimes & spillover & sparse \\8\midrule9No change & 1.00 (0.00) & 1.00 (0.00) & 1.00 (0.00) & 1.00 (0.00) & 1.00 (0.00) \\10Mean growth & 0.72 (0.06) & 1.14 (0.06) & 0.80 (0.10) & 0.97 (0.05) & 1.14 (0.06) \\11Momentum & 0.96 (0.01) & 0.98 (0.01) & 0.83 (0.04) & 0.91 (0.01) & 1.00 (0.01) \\12Random walk with drift & 0.80 (0.06) & 1.05 (0.05) & 0.70 (0.07) & 0.92 (0.03) & 1.08 (0.07) \\13Seasonal naive & 1.43 (0.12) & 1.66 (0.14) & 1.14 (0.14) & 1.33 (0.07) & 2.00 (0.17) \\14AR(2), cell & 0.71 (0.06) & 1.06 (0.05) & 0.75 (0.09) & 0.90 (0.03) & 1.08 (0.06) \\15Local linear trend & 1.49 (0.10) & 1.44 (0.11) & 0.80 (0.06) & 1.13 (0.04) & 1.87 (0.18) \\16Ridge (panel) & 1.13 (0.15) & 1.71 (0.09) & 1.20 (0.22) & 1.21 (0.10) & 1.65 (0.14) \\17LightGBM (panel) & 0.84 (0.07) & 1.23 (0.06) & 0.76 (0.07) & 0.99 (0.04) & 1.20 (0.07) \\18MLP (panel) & 0.87 (0.09) & 1.36 (0.06) & 0.88 (0.13) & 1.15 (0.11) & 1.42 (0.17) \\19LSTM & 0.87 (0.13) & 1.20 (0.04) & 0.89 (0.14) & 1.04 (0.10) & 1.41 (0.18) \\20TCN & 0.86 (0.13) & 1.25 (0.07) & 0.89 (0.14) & 1.05 (0.11) & 1.37 (0.17) \\21TFT-lite & 0.76 (0.10) & 1.16 (0.06) & 0.85 (0.17) & 0.96 (0.08) & 1.20 (0.13) \\22BHPF & 1.15 (0.16) & 1.76 (0.11) & 1.21 (0.21) & 1.22 (0.12) & 1.75 (0.15) \\23RAREF & 1.20 (0.16) & 1.71 (0.10) & 1.25 (0.20) & 1.23 (0.14) & 1.68 (0.11) \\24QANSS & 1.89 (0.25) & 1.51 (0.14) & 1.27 (0.28) & 1.07 (0.07) & 1.49 (0.07) \\25DSGFN & 1.06 (0.12) & 1.40 (0.09) & 0.94 (0.12) & 1.20 (0.13) & 1.42 (0.15) \\26\bottomrule27\end{tabular}28\begin{tablenotes}\footnotesize\item rw: random walk with a constant drift; momentum: AR(1) drifts at every level; regimes: Markov-switching provincial drift; spillover: municipal drift follows the lagged regional drift; sparse: momentum with 35\% of the sales. Values below 1 beat the no-change forecast. Classic and tree models: 10 replications; neural models: 6.\end{tablenotes}29\end{threeparttable}30\end{table}31