Touching the lower Bollinger Band is not a buy signal. That's the mistake this method is built to avoid.
In an uptrend, a pullback to the lower band can look like a good long opportunity. But buying the touch alone isn't enough. It needs confirmation.
That's where the breakout formula comes in:
> Point of initiation. In this case, lower Bollinger Bands.
> Entry space. The exact measured distance from that point to the entry signal.
> An optional time filter, since some entry windows perform better than others.
On E-mini NASDAQ, 60-minute bars, long only: Bollinger Bands tested at periods 10, 20, 30, and 40, kept coarse to avoid overfitting. Entry space measured with ATR at periods 5, 20, and 40, multiplier stepped from 0.2 to 5.
7,200 candidates prototyped across four time windows: whole day, pre-market, regular hours, and after-market.
Pre-market produced the strongest in-sample results by a clear margin. After-market had no positive results at all.
Best model after adding out-of-sample: lower Bollinger Bands, period 20, 1.5 standard deviation, plus 1x ATR 40.
Robustness Suite score: 69%.
Not a finished strategy, and results won't be identical on every market. But it shows the band touch isn't the trade. Confirmation is.