金工ETF点评：宽基ETF单日净流入20.54亿元，有色、钢铁、建材拥挤依旧高位

Quantitative Models and Construction Methods 1. Model Name: Industry Crowding Monitoring Model - Model Construction Idea: This model is designed to monitor the crowding levels of Shenwan First-Level Industry Indices on a daily basis, identifying industries with high or low crowding levels[4] - Model Construction Process: The model calculates the crowding levels of various industries based on specific metrics (not detailed in the report) and ranks them accordingly. For the previous trading day, industries such as steel, building materials, and non-ferrous metals had high crowding levels, while media, home appliances, and automobiles had lower levels[4] - Model Evaluation: The model provides a useful tool for identifying industry crowding trends and potential investment opportunities or risks[4] 2. Model Name: Premium Rate Z-Score Model - Model Construction Idea: This model identifies potential arbitrage opportunities in ETF products by calculating the Z-score of premium rates over a rolling window[5] - Model Construction Process: The Z-score is calculated as follows: $ Z = \frac{(P - \mu)}{\sigma} $ where: - $ P $ represents the premium rate of the ETF - $ \mu $ is the mean premium rate over the rolling window - $ \sigma $ is the standard deviation of the premium rate over the rolling window The model flags ETFs with significant deviations from their historical premium rates, indicating potential arbitrage opportunities[5] - Model Evaluation: The model is effective in identifying ETFs with potential mispricing but requires caution due to the risk of price corrections[5] --- Backtesting Results of Models 1. Industry Crowding Monitoring Model - No specific numerical backtesting results were provided for this model[4] 2. Premium Rate Z-Score Model - No specific numerical backtesting results were provided for this model[5] --- Quantitative Factors and Construction Methods No specific quantitative factors were detailed in the report. --- Backtesting Results of Factors No specific quantitative factor backtesting results were provided in the report.