A Bollinger Band and Price Screen for Chinese Equities

Summary

The document describes a technical stock screen based on daily amplitude, a price threshold, and the close relative to Bollinger Bands. Its stated criteria select stocks with amplitude above 1%, a close below 20, and a close above the middle band but no higher than the upper band. It provides formula examples for a Chinese retail trading platform and a Python workflow, including sorting selected stocks by trading volume.

The article offers no backtest, performance data, or evidence that the screen predicts returns. It also contains an inconsistency: the prose specifies the close between the middle and upper bands, while the Python example checks against the lower and upper bands. The discussion acknowledges that technical inputs alone omit fundamentals and financial condition, and suggests combining additional indicators or fundamental data. The examples are screening logic, not a complete portfolio or risk-management method.

Key ideas

• The screen combines amplitude, a closing-price ceiling, and Bollinger Band position.
• The described price range is above the middle band and at or below the upper band.
• The Python example differs from the prose by using the lower band as its lower bound.
• The document provides no performance evidence and notes that technical-only selection omits fundamentals.

Tags

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