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Sequential asset ranking in nonstationary time series

Published: 26 October 2022 Publication History

Abstract

We extend the research into cross-sectional momentum trading strategies. Our main result is our novel ranking algorithm, the naive Bayes asset ranker (nbar), which we use to select subsets of assets to trade from the S&P 500 index. We perform feature representation transfer from radial basis function networks to a curds and whey (caw) multivariate regression model that takes advantage of the correlations between the response variables to improve predictive accuracy. The nbar ranks this regression output by forecasting the one-step-ahead sequential posterior probability that individual assets will be ranked higher than other portfolio constituents. Earlier algorithms, such as the weighted majority, deal with nonstationarity by ensuring the weights assigned to each expert never dip below a minimum threshold without ever increasing weights again. Our ranking algorithm allows experts who previously performed poorly to have increased weights when they start performing well. Our algorithm outperforms a strategy that would hold the long-only S&P 500 index with hindsight, despite the index appreciating by 205% during the test period. It also outperforms a regress-then-rank baseline, the caw model.

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                                    ICAIF '22: Proceedings of the Third ACM International Conference on AI in Finance
                                    November 2022
                                    527 pages
                                    ISBN:9781450393768
                                    DOI:10.1145/3533271
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                                    Published: 26 October 2022

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                                    Author Tags

                                    1. learning to rank
                                    2. multivariate regression shrinkage
                                    3. online learning
                                    4. prediction with expert advice
                                    5. radial basis function networks
                                    6. transfer learning

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