Screening Stocks for a One-Day Drop After a Minimum Listing Period

Summary

This Chinese-language post proposes screening listed stocks for amplitude above a threshold, more than a year since listing, and an intraday low between four and five percent below the previous close. It explains that the amplitude condition is intended to find active shares, while the listing-age filter is meant to avoid very new stocks. The article includes indicator formulas and sample Python code for querying daily stock data.

The post cautions that a single day’s decline may not represent broader price behavior, that company-specific events or financial issues can affect results, and that selecting for volatility carries risk. It suggests adding technical and fundamental measures, including volatility or beta, but gives no backtest or evidence of rebound performance. The supplied code appears inconsistent with the stated drop interval and uses a different amplitude calculation, so the example requires correction before it can implement the described screen reliably.

Key ideas

• The proposed screen combines a minimum listing age with an amplitude threshold and a specified intraday decline.
• The decline is measured from the prior close to the current day’s low.
• The post warns that one day’s price movement may not capture a stock’s broader condition.
• It suggests adding technical, fundamental, and risk measures for further assessment.
• The sample code conflicts with the stated decline range and amplitude definition, and no test results are provided.

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