量化选股策略周报：市场风格切换，Alpha持续修复-20251018

Core Insights - The report emphasizes the construction of an AI-driven low-frequency index enhancement strategy using deep learning frameworks to build alpha and risk models [3] Market Index Performance - As of October 17, 2025, the Shanghai Composite Index fell by 1.47%, the Shenzhen Component Index dropped by 4.99%, and the CSI 300 decreased by 2.22%, indicating a general market decline with dividends performing counter to the trend [5][8] - The performance of index enhancement funds as of October 17, 2025, shows that the CSI 300 index enhancement fund had a minimum excess return of -2.97%, a median of 0.12%, and a maximum of 1.04% [12] - Year-to-date, the CSI 300 index has risen by 14.7%, while the CSI 300 index enhancement portfolio has increased by 23.7%, resulting in an excess return of 9.0% [19] Index Enhancement Fund Performance - The CSI 500 index enhancement fund recorded a minimum excess return of -0.22%, a median of 0.74%, and a maximum of 3.46% as of October 17, 2025 [12] - The CSI 1000 index enhancement fund had a minimum excess return of -0.59%, a median of 0.60%, and a maximum of 1.81% [12] - For the year, the CSI 500 index enhancement fund has achieved an excess return of 6.8%, while the CSI 1000 index enhancement fund has seen an excess return of 13.4% [24][30] Tracking Portfolio Performance - The report outlines the construction of index enhancement portfolios for the CSI 300, CSI 500, and CSI 1000 using deep learning frameworks, with weekly rebalancing and a constraint on weekly turnover rate of 10% [15] - The alpha signals are derived from a multi-source feature set and stacked multi-model strategies, while risk signals are identified using neural networks [15] CSI 300 Index Enhancement - As of October 17, 2025, the CSI 300 index has increased by 14.7%, while the CSI 300 index enhancement portfolio has risen by 23.7%, yielding an excess return of 9.0% [19] - The performance statistics for the CSI 300 index enhancement portfolio show a maximum excess return of 10.72% for the year [20] CSI 500 Index Enhancement - The CSI 500 index has risen by 22.5% year-to-date, with the CSI 500 index enhancement portfolio increasing by 29.3%, resulting in an excess return of 6.8% [24] - The performance statistics for the CSI 500 index enhancement portfolio indicate a maximum excess return of 12.39% for the year [25] CSI 1000 Index Enhancement - The CSI 1000 index has increased by 20.6% year-to-date, while the CSI 1000 index enhancement portfolio has risen by 34.0%, leading to an excess return of 13.4% [30] - The performance statistics for the CSI 1000 index enhancement portfolio show a maximum excess return of 18.12% for the year [31]