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This is the typical Bollinger Bands indicator made of linear regression for earch lines : center, high and low deviation of the average price.
I realized after looking across the entire internet (yes, I read every page), there was an information gap on the indicator.
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.
Bollinger Upper and Lower Bands measure the deviation. The upper one is the maximum positive deviation and the lower one is the maximum negative deviation from the middle band. Therefore, Bollinger Bands as an indicator is a great tool to show the markets overbought or oversold condition. It is overbought when the price has moved up and formed the maximum deviation from the middle band, and it is oversold when the price has moved down and has the maximum deviation from the middle band to the bottom of the chart.
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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.
It is all about the relationship between price and the Upper and Lower Bands. There are six basic relationships that can be quantified .
The reason I am sharing this system here is that some people always ask about it. This system has been introduced to Forex traders as an ultimate trading system that makes money for them consistently. I just want to clarify that it is not the Holy Grail, and because it is mechanical, it can generate consecutive losses sometimes.
Similarly, a trader might sell when price breaks below the lower Bollinger Band. A trader might use other confirming indicators as well, such as a support line being broken; this is shown in the example above of Wal-Mart stock breaking below support.
A Bollinger Band® is a set of lines plotted two standard deviations (positively and negatively) away from a simple moving average of the security's price.
As we noted, the Bollinger Bands trading tool consists of three lines – upper band, lower band, and a middle line.
For this example we’ve got a CSV file with 6 months of hourly SPY data, covering Sep 3, 2013 – Feb 28, 2014. SPY is an ETF tracking S&P500 index. We have nearly 2000 data points in this file. The file contains OHCL price columns, volume, and timestamp column. Disclaimer: this file has been generated using IB Data Downloader .