Group 1: Portfolio Strategy Performance Tracking - The simulated portfolio returns have rebounded, with significant increases in credit positions. The industrial ultra-long and secondary ultra-long strategy combinations in the interest rate style portfolio both recorded returns around 0.15% [2][14] - In the credit style portfolio, the industrial ultra-long and secondary ultra-long strategy combinations achieved returns of 0.41% each, leading the performance [2][15] - The weekly average return of the credit style time deposit heavy combination rose to 0.14%, an increase of 9.3 basis points compared to the previous week, while the city investment heavy combination's average weekly return increased to 0.23%, up over 20 basis points from last week [2][18] Group 2: Sources of Returns - The interest income from various strategy combinations has slightly rebounded, with most strategies showing an increase in interest income. The city investment short-end sinking and secondary debt sinking strategies saw interest income increases of approximately 0.04 basis points [3][27] - The annualized interest income for most combinations remains below 2%, except for the city investment short-end sinking and barbell combinations, which are still above 1.95% [3][27] - The contribution of interest income in credit style combinations generally falls within the range of 10% to 25%, with capital gains being the primary source of returns, particularly for the city investment bullet-type and secondary debt duration combinations, where interest contributions dropped to around 13% [3][27] Group 3: Credit Strategy Excess Return Tracking - Over the past four weeks, the cumulative excess return difference between duration strategies and sinking strategies has widened. The cumulative excess returns for city investment barbell, city investment duration, and broker debt duration strategy combinations were 33.6 basis points, 7.4 basis points, and 5.8 basis points, respectively [4][31] - The excess returns for short-end strategies have decreased, with the time deposit strategy dropping to around -1.6 basis points, while the city investment sinking strategy slightly surpassed the benchmark [4][34] - The excess returns for ultra-long strategies have rebounded to levels seen in early June, with the secondary ultra-long strategy combination's excess return rising to over 17 basis points this week, contrasting with the negative readings from the previous three weeks [4][34]

Quantitative Models and Construction Methods 1. Model Name: Interest Rate Style Portfolio - **Model Construction Idea**: The portfolio is constructed by allocating 80% to interest rate bonds and 20% to credit bonds, with the interest rate bond portion using 10-year government bonds and the credit bond portion including 20% ultra-long bonds[13][19] - **Model Construction Process**: - **Bullet Strategy**: Allocates 1-year AAA interbank certificates of deposit (CDs), 3-year AA+ municipal bonds, and 3-year AAA- perpetual bonds[13] - **Duration Strategy**: Allocates 4-year AA+ municipal bonds and 4-year AAA- perpetual bonds[13] - **Ultra-long Strategy**: Allocates 10-year AA+ municipal bonds and 10-year AAA- subordinated bonds[13] - **Mixed Barbell Strategy**: Allocates 1-year AA+ municipal bonds and 10-year AA+ municipal bonds in a 1:1 ratio[13] - **Model Evaluation**: The interest rate style portfolios generally outperform their credit style counterparts in absolute returns, with cumulative returns around 1% year-to-date[10] 2. Model Name: Credit Style Portfolio - **Model Construction Idea**: The portfolio is constructed by allocating 20% to government bonds and 80% to credit bonds, with a focus on various credit strategies such as bullet, duration, and ultra-long strategies[13][19] - **Model Construction Process**: - **Bullet Strategy**: Allocates 1-year AAA interbank CDs and 3-year AA+ municipal bonds[13] - **Duration Strategy**: Allocates 4-year AA+ municipal bonds and 4-year AAA- perpetual bonds[13] - **Ultra-long Strategy**: Allocates 10-year AA+ municipal bonds and 10-year AAA- subordinated bonds[13] - **Mixed Barbell Strategy**: Allocates 1-year AA+ municipal bonds and 10-year AAA- subordinated bonds in a 1:1 ratio[13] - **Model Evaluation**: Credit style portfolios, such as the municipal bond short-end sinking strategy, achieved cumulative returns of 1.04%, ranking among the top performers[10] --- Model Backtesting Results 1. Interest Rate Style Portfolio - **Weekly Returns**: Ultra-long strategies (e.g., secondary ultra-long and industrial ultra-long) achieved weekly returns of 0.19%[2][16] - **Cumulative Returns**: Year-to-date cumulative returns for various strategies are approximately 1%[10] 2. Credit Style Portfolio - **Weekly Returns**: Secondary ultra-long and industrial ultra-long strategies achieved weekly returns of 0.23% and 0.21%, respectively[2][16] - **Cumulative Returns**: Municipal bond short-end sinking, duration, and bullet strategies achieved cumulative returns of 1.04%, 0.96%, and 0.89%, respectively[10] --- Quantitative Factors and Construction Methods 1. Factor Name: Coupon Contribution - **Factor Construction Idea**: Measures the contribution of coupon income to portfolio returns, focusing on stability and low volatility[3][28] - **Factor Construction Process**: - Calculate the initial yield-to-maturity (YTM) of bonds in the portfolio - Multiply the YTM by the holding period to estimate coupon income[13] - **Factor Evaluation**: Coupon contributions for most strategies are concentrated between 20% and 40%, with municipal bond short-end sinking and barbell strategies maintaining stable coupon yields around 0.039%[3][28] 2. Factor Name: Excess Return - **Factor Construction Idea**: Measures the return of a strategy relative to a benchmark, focusing on strategies that outperform consistently[4][33] - **Factor Construction Process**: - Benchmark portfolios are constructed with specific allocations (e.g., 20% government bonds, 64% 3-year AA+ municipal bonds, and 16% 10-year AA+ industrial bonds)[36][38] - Calculate the difference between the strategy's return and the benchmark return over a specified period[36][38] - **Factor Evaluation**: Municipal bond duration and barbell strategies achieved cumulative excess returns of 11.3bp and 10.8bp, respectively, over the past four weeks[4][33] --- Factor Backtesting Results 1. Coupon Contribution - **Municipal Bond Strategies**: Coupon yields for short-end sinking and barbell strategies remained stable at approximately 0.039%[3][28] - **Other Strategies**: Most strategies had annualized coupon yields below 2%[3][28] 2. Excess Return - **Short-term Strategies**: Interbank CD bullet strategies achieved excess returns of 1.9bp, the highest since April[36][38] - **Medium-to-Long-term Strategies**: Municipal bond duration and barbell strategies achieved cumulative excess returns of 11.3bp and 10.8bp, respectively[4][33] - **Ultra-long Strategies**: Industrial ultra-long and secondary ultra-long strategies outperformed benchmarks by approximately 15bp[4][36]