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Xiangcai Securities· 2025-08-14 10:36

Quantitative Models and Construction Methods 1. Model Name: Southbound Capital Monthly Net Purchase Model - **Model Construction Idea**: This model uses the monthly net purchase amount of Southbound Capital to evaluate its effectiveness in driving sector rotation in the Hong Kong stock market[12][40]. - **Model Construction Process**: - The net purchase amount for each stock is calculated as: $$ S_{i,t} = (N_{i,t} - N_{i,t-1}) * P_{i,t} $$ Where: $ N_{i,t} $ = Southbound Capital holdings of stock $ i $ on day $ t $[37] $ P_{i,t} $ = Average price of stock $ i $ on day $ t $[37] - The sector-level net purchase amount is aggregated as: $$ Ind_{t} = \sum S_{i,t} $$ Where $ Ind_{t} $ represents the cumulative net purchase amount for the sector on day $ t $[37]. - **Model Evaluation**: The model demonstrates a positive Rank IC mean, indicating its effectiveness in sector rotation strategies[40]. 2. Model Name: Market Cap-Adjusted Southbound Capital Model - **Model Construction Idea**: Adjust the Southbound Capital net purchase amount by sector market capitalization to improve strategy performance[40]. - **Model Construction Process**: - The net purchase amount is calculated as in the previous model. - Adjustments are made based on the market capitalization of each sector to normalize the influence of large-cap sectors[40]. - **Model Evaluation**: This adjustment improves strategy returns and reduces maximum drawdown compared to the unadjusted model[46][48]. 3. Model Name: Three-Year Percentile Southbound Capital Model - **Model Construction Idea**: Use the three-year percentile rank of Southbound Capital net purchases to identify sector preferences over a longer historical period[40]. - **Model Construction Process**: - Calculate the three-year percentile rank of the net purchase amount for each sector. - Rank sectors based on their percentile values to determine rotation preferences[40]. - **Model Evaluation**: The three-year percentile model provides a longer-term perspective but shows slightly lower Rank IC values compared to the unadjusted model[40]. 4. Model Name: Market Cap-Adjusted Three-Year Percentile Model - **Model Construction Idea**: Combine market capitalization adjustments with the three-year percentile rank to enhance strategy robustness[40]. - **Model Construction Process**: - Apply market cap adjustments to the three-year percentile rank of net purchases. - Rank sectors based on the adjusted values to guide rotation decisions[40]. - **Model Evaluation**: This model achieves the best overall performance, with the highest Sharpe ratio and IR among all tested strategies[46][48]. --- Model Backtest Results 1. Southbound Capital Monthly Net Purchase Model - **Annualized Return**: 4.73% - **Excess Return**: 3.22% - **Maximum Drawdown**: 56.01% - **Sharpe Ratio**: 0.3130 - **IR**: 0.3864[52] 2. Market Cap-Adjusted Southbound Capital Model - **Annualized Return**: 5.40% - **Excess Return**: 3.89% - **Maximum Drawdown**: 50.24% - **Sharpe Ratio**: 0.3384 - **IR**: 0.3901[52] 3. Three-Year Percentile Southbound Capital Model - **Annualized Return**: 3.61% - **Excess Return**: -2.05% - **Maximum Drawdown**: 54.33% - **Sharpe Ratio**: 0.2704 - **IR**: 0.1498[52] 4. Market Cap-Adjusted Three-Year Percentile Model - **Annualized Return**: 7.99% - **Excess Return**: 2.33% - **Maximum Drawdown**: 45.84% - **Sharpe Ratio**: 0.4350 - **IR**: 0.4713[52] --- Quantitative Factors and Construction Methods 1. Factor Name: Southbound Capital Monthly Net Purchase - **Factor Construction Idea**: Measure the monthly net purchase amount of Southbound Capital to assess its impact on sector rotation[40]. - **Factor Construction Process**: - Calculate the net purchase amount for each stock and aggregate it at the sector level as described in the model construction process[37]. - **Factor Evaluation**: The factor shows a positive Rank IC mean, indicating its predictive power for sector rotation[40]. 2. Factor Name: Market Cap-Adjusted Southbound Capital - **Factor Construction Idea**: Adjust the net purchase amount by sector market capitalization to reduce bias from large-cap sectors[40]. - **Factor Construction Process**: - Apply market cap adjustments to the net purchase amount as described in the model construction process[40]. - **Factor Evaluation**: The adjustment improves the factor's effectiveness, as evidenced by higher Rank IC values[40]. 3. Factor Name: Three-Year Percentile Southbound Capital - **Factor Construction Idea**: Use the three-year percentile rank of net purchases to capture longer-term sector preferences[40]. - **Factor Construction Process**: - Calculate the three-year percentile rank for each sector's net purchase amount[40]. - **Factor Evaluation**: The factor provides a longer-term perspective but shows slightly lower Rank IC values compared to the unadjusted factor[40]. 4. Factor Name: Market Cap-Adjusted Three-Year Percentile - **Factor Construction Idea**: Combine market cap adjustments with the three-year percentile rank to enhance factor robustness[40]. - **Factor Construction Process**: - Apply market cap adjustments to the three-year percentile rank as described in the model construction process[40]. - **Factor Evaluation**: This factor achieves the best overall performance, with the highest Rank IC values among all tested factors[40]. --- Factor Backtest Results 1. Southbound Capital Monthly Net Purchase Factor - **Rank IC Mean**: 7.72% - **Rank IC t-Value**: 24.31%[41] 2. Market Cap-Adjusted Southbound Capital Factor - **Rank IC Mean**: 5.15% - **Rank IC t-Value**: 15.66%[41] 3. Three-Year Percentile Southbound Capital Factor - **Rank IC Mean**: 4.13% - **Rank IC t-Value**: 12.75%[41] 4. Market Cap-Adjusted Three-Year Percentile Factor - **Rank IC Mean**: 4.55% - **Rank IC t-Value**: 14.82%[41]