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  2. Sherlock Holmes
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  4. Wednesday, 14 September 2022
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Close Bollinger bands crossover is a client-side VTL indicator. This indicator is based on Bollinger bands. The idea behind Bollinger bands is when the price is above the upper band, it is too high, and a mean reversion is expected. This indicator marks a red down arrow when the price closes above the upper Bollinger band. When the price close inside the Bollinger bands after closing above the upper band, it plots a green up arrow.
This indicator is useful in short-term mean reversion trading. When the red arrow appears, consider opening a short trade and then cover the short trade when the price closes inside the band. However, in strong trends, this may fail. It is better to use these signals in rangebound market conditions.
Parameters:
1. Period – The Bollinger band period, default is 20
2. Deviation – The standard deviations for bands, default is 2
3. Shift – Bar shift, default is 0



The basic assumption of Bollinger bands is price will remain inside the band most of the time, when price moves beyond the band, it will immediately come back inside the band. However, in strong trends, prices remain outside the band for longer periods before reverting inside the band. Identifying the overall market conditions before using the signals to open trades is important. In rangebound market conditions, these signals work better.
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