量化周报：市场波动进一步加大-20250907

• The report mentions the construction of the A-share prosperity index, which is based on the Nowcasting target of the year-on-year net profit of the Shanghai Composite Index's parent company. The details of the index construction can be found in the report "Perspective Analysis: Construction and Observation of A-share Prosperity High-frequency Index" [33][36] - The A-share sentiment index is constructed by dividing the market into four quadrants based on the direction of changes in volatility and trading volume. Among these, the quadrant with rising volatility and declining trading volume shows significant negative returns, while the others show significant positive returns. This index includes bottom-warning and top-warning signals. Relevant research is detailed in the report "Perspective Analysis: Construction and Observation of A-share Sentiment Index" [37][42] - The report evaluates the performance of the Middle 500 Enhanced Portfolio and the CSI 300 Enhanced Portfolio. The Middle 500 Enhanced Portfolio achieved a cumulative excess return of 50.56% relative to the Middle 500 Index since 2020, with a maximum drawdown of -4.99% [48][50]. The CSI 300 Enhanced Portfolio achieved a cumulative excess return of 38.85% relative to the CSI 300 Index since 2020, with a maximum drawdown of -5.86% [55][56] - The report constructs ten style factors for the A-share market based on the BARRA factor model. These include size (SIZE), beta (BETA), momentum (MOM), residual volatility (RESVOL), non-linear size (NLSIZE), valuation (BTOP), liquidity (LIQUIDITY), earnings yield (EARNINGS_YIELD), growth (GROWTH), and leverage (LVRG) [60] - The report highlights the recent performance of style factors. Beta factor showed the highest excess return, while momentum and non-linear size factors exhibited significant negative excess returns. High-beta stocks performed well, while value and profitability factors underperformed [61][64]