Towards interpretable stock trend prediction through causal inference

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Department of Computer Science, The University of Hong Kong, Pokfulam Road, Hong Kong ^{[1
]}

不详 ^{[2
]}

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Expert Sys Appl | 2024年

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With the emergence of artificial intelligence; deep learning techniques have been widely deployed in forecasting stock markets. However; existing deep-learning-based models for news-based forecasts of stock trends are mostly black-box and difficult to explain. The procedure by which how final predictions are made within models keeps unknown; making it hard to interpret why one prediction should be better than the other. To provide explanations on predictions; this paper proposes to inject causal inference into model procedures and causally interpret predictions. We first generate a causal graph from financial news; and then integrate the information in the causal graph into a neural network model for stock trend prediction. Moreover; in order to better extract keywords from financial news we introduce a novel keyword extraction method named Distinguishable Word Filtering by Kolmogorov–Smirnov Test (DWF-KST). The experiment results on five financial datasets demonstrate that not only our proposed model explicitly provides an interpretation of prediction results; but also outperforms the state-of-art methods. the achieved results boost predictions of S&P 500 2-category from 89.7% to 97.4%; 3-category from 77.4% to 82.5%; and 5-category from 61.5% to 71.6%. For the other two indexes; the performances of Dow index improve from 86.2% to 90.2% and Nasdaq index improve from 76.4% to 78.9%. © 2023 Elsevier Ltd;

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