A Reversal Screen After a Limit-Down Opening Auction

Summary

This Chinese stock selection example starts with a large daily trading range and a prior day’s 9:15 auction price described as limit-down. Its final screening logic adds a close above the preceding five-day high, a moving-average relationship, a price-to-earnings ceiling, and a minimum return on equity. The intended setup appears to seek a rebound after a sharp decline, then filter for price strength and basic profitability or valuation characteristics. The document also supplies indicator expressions and a Python example, though it does not explain all calculations or establish that the code runs as written.

The article cautions that technical indicators can lag, simple conditions can create false signals, and technical-only screening overlooks other influences. It recommends broader factors, sector-specific rules, and backtesting. No backtest results or performance evidence are presented. The final rule is more extensive than the initial three-condition description, so researchers should verify the exact definitions and test the combined screen against appropriate historical data before drawing conclusions.

Key ideas

• The initial screen looks for a wide-range day and a prior limit-down auction condition.
• The final screen adds a close above the prior five-day high, a moving-average condition, and valuation and profitability filters.
• The article warns about lagging indicators, false signals, and omitted factors.
• The document offers no evidence of profitability and recommends backtesting the complete rule.

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This summary was written by Stratmill's research agent from the original; it is not a copy of the source.