- The report tracks the performance of Barra style factors for August 2025, showing that the market capitalization factor recorded a return of 2.54%, the book-to-market ratio factor recorded a return of -0.67%, the growth factor recorded a return of 0.42%, and the earnings expectations factor recorded a return of 0.08%[4][14] - The report introduces a series of stock selection factors based on trading behavior, including the Ideal Reversal Factor, Smart Money Factor, APM Factor, and Ideal Amplitude Factor[5][14] - The Ideal Reversal Factor is constructed by segmenting the traditional reversal factor using W-shaped cuts, focusing on the average transaction amount per day to identify the strongest reversal days[39] - The Smart Money Factor is constructed by analyzing minute-level price and volume data to identify periods with significant institutional trading activity, using the formula $St = \frac{|Rt|}{Vt^{0.25}}$, where $Rt$ is the return at minute $t$ and $Vt$ is the volume at minute $t$[40][42] - The APM Factor measures the difference in stock price behavior between morning (or overnight) and afternoon sessions, using a regression model to calculate residuals and then computing the statistic $stat = \frac{\mu(\delta_t)}{\sigma(\delta_t)/\sqrt{N}}$, where $\delta_t$ is the difference between overnight and afternoon residuals[41][43][44] - The Ideal Amplitude Factor measures the difference in amplitude information between high and low price states, calculated as $V = V_{high} - V_{low}$, where $V_{high}$ is the average amplitude on high-price days and $V_{low}$ is the average amplitude on low-price days[46] - The historical performance of the Ideal Reversal Factor shows an IC mean of -0.050, rankIC mean of -0.060, IR of 2.48, and a long-short monthly win rate of 77.8%[6][15] - The historical performance of the Smart Money Factor shows an IC mean of -0.037, rankIC mean of -0.061, IR of 2.71, and a long-short monthly win rate of 81.6%[6][18] - The historical performance of the APM Factor shows an IC mean of 0.029, rankIC mean of 0.034, IR of 2.26, and a long-short monthly win rate of 77.4%[6][22] - The historical performance of the Ideal Amplitude Factor shows an IC mean of -0.053, rankIC mean of -0.073, IR of 2.99, and a long-short monthly win rate of 83.2%[6][26] - The composite trading behavior factor, which combines the above factors, shows an IC mean of 0.066, rankIC mean of 0.092, IR of 3.25, and a long-short monthly win rate of 82.0%[6][30] - In August 2025, the Ideal Reversal Factor recorded a long-short return of -1.28%, with a 12-month long-short monthly win rate of 58.3%[7][15] - In August 2025, the Smart Money Factor recorded a long-short return of -1.17%, with a 12-month long-short monthly win rate of 83.3%[7][18] - In August 2025, the APM Factor recorded a long-short return of -0.22%, with a 12-month long-short monthly win rate of 50.0%[7][22] - In August 2025, the Ideal Amplitude Factor recorded a long-short return of -0.15%, with a 12-month long-short monthly win rate of 66.7%[7][26] - In August 2025, the composite trading behavior factor recorded a long-short return of -0.90%, with a 12-month long-short monthly win rate of 75.0%[7][30]

- Model Name: Barra Style Factors; Model Construction Idea: Measure the performance of common Barra style factors in April 2025; Model Construction Process: Calculate the returns of various factors such as market capitalization, book-to-market ratio, growth, and earnings expectations; Model Evaluation: Provides insights into the performance of different style factors in the market[4][14] - Factor Name: Ideal Reversal Factor; Factor Construction Idea: Identify the strongest reversal days based on the average transaction amount per trade; Factor Construction Process: 1. Retrieve the past 20 days of data for the selected stock 2. Calculate the average transaction amount per trade for each day 3. Sum the returns of the top 10 days with the highest average transaction amount, denoted as M_high 4. Sum the returns of the bottom 10 days with the lowest average transaction amount, denoted as M_low 5. Calculate the Ideal Reversal Factor as M = M_high - M_low[5][46][49] - Factor Name: Smart Money Factor; Factor Construction Idea: Identify the participation of smart money in trading based on minute-level price and volume data; Factor Construction Process: 1. Retrieve the past 10 days of minute-level data for the selected stock 2. Construct the indicator $ S_t = \frac{|R_t|}{V_t^{0.25}} $, where $ R_t $ is the return at minute t and $ V_t $ is the volume at minute t 3. Sort the minute data by $ S_t $ in descending order and select the top 20% of minutes by cumulative volume as smart money trades 4. Calculate the volume-weighted average price (VWAP) of smart money trades, denoted as VWAP_smart 5. Calculate the VWAP of all trades, denoted as VWAP_all 6. Calculate the Smart Money Factor as $ Q = \frac{VWAP_{smart}}{VWAP_{all}} $[5][47] - Factor Name: APM Factor; Factor Construction Idea: Measure the difference in stock price behavior between morning (or overnight) and afternoon sessions; Factor Construction Process: 1. Retrieve the past 20 days of data for the selected stock 2. Record the overnight and afternoon returns for both the stock and the index 3. Perform a regression of the form $ r_t = \alpha + \beta R_t + \epsilon_t $ to obtain residuals 4. Calculate the difference between overnight and afternoon residuals 5. Construct the statistic $ \text{stat} = \frac{\mu(\delta_t)}{\sigma(\delta_t)/\sqrt{N}} $ 6. Regress the statistic against the momentum factor to obtain the APM Factor[5][48][50] - Factor Name: Ideal Amplitude Factor; Factor Construction Idea: Measure the difference in amplitude information between high and low price states; Factor Construction Process: 1. Retrieve the past 20 days of data for the selected stock 2. Calculate the daily amplitude as (highest price/lowest price - 1) 3. Calculate the average amplitude for the top 25% of days with the highest closing prices, denoted as V_high 4. Calculate the average amplitude for the bottom 25% of days with the lowest closing prices, denoted as V_low 5. Calculate the Ideal Amplitude Factor as V = V_high - V_low[5][51] Model and Factor Performance - Barra Style Factors: Market Capitalization Factor return: 0.09%, Book-to-Market Ratio Factor return: 0.11%, Growth Factor return: -0.19%, Earnings Expectations Factor return: -0.02%[4][14] - Ideal Reversal Factor: IC: -0.051, rankIC: -0.061, IR: 2.55, Long-Short Monthly Win Rate: 78.5%, April 2025 Long-Short Return: 0.89%, Last 12 Months Long-Short Monthly Win Rate: 66.7%[6][16] - Smart Money Factor: IC: -0.038, rankIC: -0.061, IR: 2.78, Long-Short Monthly Win Rate: 82.5%, April 2025 Long-Short Return: 0.89%, Last 12 Months Long-Short Monthly Win Rate: 100.0%[6][21] - APM Factor: IC: 0.030, rankIC: 0.034, IR: 2.32, Long-Short Monthly Win Rate: 77.6%, April 2025 Long-Short Return: -0.27%, Last 12 Months Long-Short Monthly Win Rate: 75.0%[6][25] - Ideal Amplitude Factor: IC: -0.054, rankIC: -0.073, IR: 3.04, Long-Short Monthly Win Rate: 83.9%, April 2025 Long-Short Return: 2.52%, Last 12 Months Long-Short Monthly Win Rate: 83.3%[6][30] - Composite Trading Behavior Factor: IC: 0.068, rankIC: 0.092, IR: 3.36, Long-Short Monthly Win Rate: 82.2%, April 2025 Long-Short Return: 0.99%, Last 12 Months Long-Short Monthly Win Rate: 83.3%[6][35]