量化周报：市场波动开始加大-20250901

• The report discusses the performance of the A-share market, noting that the market volatility has increased recently, with the Shanghai Composite Index rising by 0.84% over the week[1][9] - The report highlights the performance of the enhanced index portfolios, with the CSI 500 enhanced portfolio underperforming the benchmark by 0.66% and the CSI 300 enhanced portfolio outperforming the benchmark by 0.83%[2][45] - The report identifies the market cap factor as the dominant style factor, with high momentum stocks performing well and value and leverage factors performing poorly[2][55] - The A-share sentiment index signals are discussed, with the bottom sentiment index signal being "empty" and the top sentiment index signal being "more," resulting in an overall "more" signal[2][38] - The report includes a detailed analysis of the construction and observation of the A-share sentiment index, which is based on market volatility and trading volume changes[33][36][38] - The report provides a list of semiconductor concept stocks, identified through a theme mining algorithm based on news and research report texts[45] - The report includes the performance and holdings of the CSI 500 and CSI 300 enhanced portfolios, with specific details on the stocks and their respective weights in the portfolios[45][49][54] - The report discusses the performance of various style factors, including market cap, beta, momentum, residual volatility, non-linear market cap, value, liquidity, earnings yield, growth, and leverage, and their correlations[55][57] - The report provides a performance attribution analysis of major indices, including the Shanghai Composite Index, Shanghai 50, CSI 300, CSI 500, and others, based on their exposure to different style factors[64][65][68][70][74][77][78]