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Scale or speed? When do path signatures improve volatility-regime forecasts?

Lyu, Yang et al.
arXiv (All) · Papers
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We study when path signatures, increasingly used as model-free features of return paths, improve out-of-sample forecasts of volatility regimes. In daily United States and developed-market equity returns from 2005 to 2025, machine-learning classifiers do not beat a heterogeneous autoregressive (HAR)
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