金融工程市场跟踪周报：市场波动温和提升，杠铃组合或占优-20250428

• The report discusses the "Momentum Factor" as a key quantitative factor that performed well in the market during the week of April 21-25, 2025. The factor's construction is based on identifying stocks with strong recent performance, which are expected to continue outperforming in the short term[12][24][26] - The "Momentum Sentiment Indicator" is calculated by measuring the proportion of stocks within the CSI 300 Index that have achieved positive returns over a specified period (N days). The formula is: $ \text{CSI 300 Index N-day Upward Stock Proportion} = \frac{\text{Number of CSI 300 stocks with positive returns in the past N days}}{\text{Total number of CSI 300 stocks}} $ This indicator captures market sentiment and is used to identify potential market bottoms or overheating phases. It is noted that the indicator can quickly capture upward opportunities but may fail to avoid risks during market downturns[26][27][29] - The "Momentum Sentiment Indicator Timing Strategy" applies two smoothing windows (N1 and N2, where N1 > N2) to the indicator. When the short-term smoothed line (fast line) exceeds the long-term smoothed line (slow line), it signals a bullish market sentiment. Conversely, when the fast line is below the slow line, it indicates a neutral or bearish sentiment. As of April 25, 2025, the fast line was below the slow line, suggesting a cautious market outlook[27][29][33] - The "Moving Average Sentiment Indicator" uses eight moving averages (8, 13, 21, 34, 55, 89, 144, 233) of the CSI 300 Index closing prices. The indicator assigns values based on the position of the current price relative to these averages. If the current price exceeds the values of more than five moving averages, it signals a bullish sentiment. As of April 25, 2025, the CSI 300 Index was in a non-optimistic sentiment zone[33][37] - The report highlights "Cross-sectional Volatility" as a measure of short-term alpha opportunities. It notes that the cross-sectional volatility of CSI 300, CSI 500, and CSI 1000 Index components increased week-over-week, indicating improved alpha conditions. Over the past quarter, the cross-sectional volatility of CSI 300 and CSI 1000 was in the upper-middle range of the past six months, while CSI 500 was in the middle range[38][41] - "Time-series Volatility" is another alpha-related metric discussed. The time-series volatility of CSI 300, CSI 500, and CSI 1000 Index components rose week-over-week, signaling better alpha conditions. Over the past quarter, the time-series volatility of these indices was in the upper-middle range of the past six months[41][43] - The report evaluates the "Fund Concentration Degree Indicator," which measures the standard deviation of cross-sectional returns of concentrated fund portfolios. A lower standard deviation indicates higher fund concentration, while a higher standard deviation suggests fund dispersion. As of April 25, 2025, the fund concentration degree slightly increased, and the excess returns of concentrated funds and stocks declined week-over-week[85][88][90]