“…In addition, the final forecast can be the fusion result of different types of predictions, such as the fusion of stock movement trends and external factors [56], the fusion of stock prices and external factors [51], the fusion of stock movement probability and external factors [78], and the fusion of stock volatility and external factors [50]. Binary Stock movement trend (e.g., up and down) [28], [29], [32], [39], [40], [41], [42], [43], [44], [46], [48], [62], [64], [68], [73], [75], [77], [84], [85], [88] Stock movement probability [30], [49], [78], [93], [96] Multiclass Stock movement trend (e.g., up, neutral, and down) [22], [34], [56] Stock turning indicator [57], [58] Stock risk level [27] Confidence level of stock movement [33] Effect level of external factors [56] TABLE VIII STUDIES RELATED TO REGRESSION TASKS Forecasts of Base Learners Author(s)…”