Strategy and trading together with Bollinger bands
It is possible to trade with Bollinger bands in the world of Forex too. This indicator helps us to measure the volatility of prices. Bollinger Bands consist of three bands, specifically a higher band, a lower band and a central band. The central band is a simple moving average, normally set at 20 periods.
Bollinger bands are designed to show the traders the concept of what exactly the volatility of the market is. The basic premise of the Bollinger bands is that the price should normally fall within two standard deviations (but these can be customized basing on the market trader experience), or the upper band and the lower one. Therefore, we might have a trend reversal near the upper and lower bands. Since the central line is a moving average which represents the trend of the market, it can be used as support or resistance.
The performance of NZD / JPY during the last few months, shows us how the Bollinger bands with 3 standard deviations from the 20 days average offer traders a great tool to easily take advantage of the existing trading range on the cross. The long trade on the bottom band and the short one on the upper band has been a very profitable trading since now, still including just a single false signal during the last two years.

NZDUSD with Bollinger Bands Indicator
The first chance that the operators have to use this indicator is to identify the potential overbought and oversold levels. The best way to trade with the Bollinger bands, anyway, is to wait for the confirmation of other indicators too, as if prices remain outside of the side bands, we can have a strong tendency or the warning of a reversal.
A concrete example came from AUD / CHF in September 2011. After a dramatic decline to 0.733, the cross has started an upward trend finding a resistance in the upper band at 2 standard deviations from the average at 20 days. The next returning movement found a valuable support in the central average, capable of pushing up AUD / CHF again. At that point the cross began to "walk" on the upper band, leaving marginally from it on several occasions. The short trade of AUD / CHF on the contact with upper band would have been a mistake, while the correct strategy was to wait for an end of the day within the upper band combined with an RSI above 70 points. The dynamics of AUD / CHF during the following days confirmed the correctness of the strategy.

AUDCHF with Bollinger Bands Indicator
Often, after periods of low volatility, breakages of the bands can occur. We must pay attention to this problem when we use this strategy, since the first exit level is often a false one. When the volatility decreases to very low levels, the so-called "squeeze" takes place. An indicator called BandWidth has been created to measure it. Usually, a squeeze occurs when the BandWidth indicator drops to the lowest level of the last six months.
Let’s check now the squeeze in action on USD / CAD at the end of 2007. At this point, the consolidation starts and the resulting trading range narrows considerably. The average flattens out and goes right in the middle of the quotations with the Bollinger bands that flatten towards the average. At this stage, a false signal called "head fake" could happen with the cross going to break a band and then returning on its steps and taking the opposite direction. In this case, the correct operation for USD / CAD was to get a long entry closing above the upper band and a stop loss on the bottom of that session. Applying that kind of trading would have allowed to catch a very important upwards movement.

USDCAD with Bollinger Bands Indicator
There is also the opposite version of Squeeze, or the so-called expansion. In this case there is such a powerful trend at a very high volatility that, for example, in case of an uptrend the lower band diverges from the top pointing downwards.
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http://www.buzzinforex.com/trading-strategies/strategy-and-trading-together-with-bollinger-bands
http://www.buzzinforex.com/trading-strategies/strategy-and-trading-together-with-bollinger-bands