Table 4: Comparisons of indices’ predictions for different forecasting models.

Index errors BPNN STNN ERNN ST-ERNN

SSE
MAE 45.3701 24.9687 37.262647 12.7390
RMSE 54.4564 40.5437 49.3907 37.0693
MAPE 20.1994 11.8947 18.2110 4.1353
MAPE(100) 5.0644 3.6868 4.3176 2.6809

TWSE
MAE 252.7225 140.5971 151.2830 105.6377
RMSE 316.8197 186.8309 205.4236 136.1674
MAPE 3.2017 1.7303 1.8449 1.3468
MAPE(100) 2.2135 1.1494 1.3349 1.2601

KOSPI
MAE 74.3073 56.3309 47.9296 18.2421
RMSE 77.1528 58.2944 50.8174 21.0479
MAPE 16.6084 12.4461 10.9608 4.2257
MAPE(100) 7.4379 5.9664 4.9176 2.1788

Nikkei225
MAE 203.8034 138.1857 166.2480 68.5458
RMSE 238.5933 169.7061 207.3395 89.0378
MAPE 1.8556 1.2580 1.5398 0.6010
MAPE(100) 0.7674 0.5191 0.4962 0.4261