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Bollinger bands indicator - StockCharts.com
Bollinger Bands - Trend Indicators - MetaTrader 5
The central band shows the price's simple moving average. The upper and lower bands represent levels where the price is considered relatively high or low compared to its recent moving average.
Just like in trading, some trading tools and indicators are best used in particular environments or situations. So, the more tools you have, the better you can adapt to the ever-changing market environment.
Binary options traders consider Bollinger bands one of the best indicators for its simplicity and its easy to read structure and readability to identify the prices tendency or the price oscillation. These bands can be used to process and analyze any period of time with a high sensitivity for a future price estimation.
In this article, we show you how to use Bollinger Bands ® to improve your chart reading skills and how to identify high probability trade entries.
The Bollinger bands are also used to represent trend as it is built up on the moving average. Buy and sell signals are triggered when prices tap or close above or below the upper or lower bands. In periods of extreme volatility, especially seen during break outs, price tends to trade close to the upper or lower bands for extended periods of time. Trend signals are also generated when the bands are expanding and price breaks the upper or lower bands, signaling a continuation of the trend in the direction of the break out.
%B can be used to identify overbought and oversold situations. However, it is important to know when to look for overbought readings and when to look for oversold readings. As with most momentum oscillators, it is best to look for short-term oversold situations when the medium-term trend is up and short-term overbought situations when the medium-term trend is down. In other words, look for opportunities in the direction of the bigger trend, such as a pullback within a bigger uptrend. Define the bigger trend before looking for overbought or oversold readings.
When the market becomes more volatile, the bands will correspond by widening and moving away form the middle line. When the market slows down and becomes less volatile, the bands will move closer together.
In other words, the higher the standard deviation the wider the price range of an underlying asset for the given period of time. Measuring how far the price can deviate from its average value is helpful when one wants to predict future price fluctuations.
Bollinger %b and Band Width. Bollinger %b is described by John Bollinger on his website. It indicates the position of Closing Price relative to Bollinger ...
The purpose of Bollinger Bands is to provide a relative definition of high and low prices of a market. By definition, prices are high at the upper band and low at the lower band. This definition can aid in rigorous pattern recognition and is useful in comparing price action to the action of indicators to arrive at systematic trading decisions. 
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Bollinger bands are formed by three lines. The middle line (ML) is a usual Moving Average.
ML = SUM [CLOSE, N]/N
They were created by John Bollinger in the early 1980s. The purpose of these bands is to give you a relative definition of high and low. So in theory, the prices are high at the upper band and then are low at the lower band. Bollinger bands include three different lines. The upper, middle, and lower band. The middle band basically serves as a base for both the upper and lower.
The default setting for Bollinger %b and Band Width is a 20-Day simple moving average with bands drawn at 2 standard deviations.
Bollinger Bands® consist of a center line and two price channels (bands) above and below it. The center line is an exponential moving average ; the price channels are the standard deviations of the stock being studied. The bands will expand and contract as the price action of an issue becomes volatile (expansion) or becomes bound into a tight trading pattern (contraction). (Learn about the difference between simple and exponential moving averages by checking out Moving Averages: What Are They? )
Bollinger Bands® are a highly popular technique. Many traders believe the closer the prices move to the upper band, the more overbought the market, and the closer the prices move to the lower band, the more oversold the market. John Bollinger has a set of 22 rules to follow when using the bands as a trading system.
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This indicator is specially engineered for scalpers who want to depend on a reliable tool to detect the swinging points at lower time frame. You’ll be able to use its full version on any currency pair across the market.
Chart 2 shows Nordstrom (JWN) with a W-Bottom in January-February 2010. First, the stock formed a reaction low in January (black arrow) and broke below the lower band. Second, there was a bounce back above the middle band. Third, the stock moved below its January low and held above the lower band. Even though the 5-Feb spike low broke the lower band, Bollinger Bands are calculated using closing prices so signals should also be based on closing prices. Fourth, the stock surged with expanding volume in late February and broke above the early February high. Chart 3 shows Sandisk with a smaller W-Bottom in July-August 2009.