# Bollinger Bands was ist

Like anything else in the market, there are no guarantees. Because standard deviation is a measure of volatility, when the markets become more volatile, the bands widen; during less volatile periods, the bands contract. One day I copied a volatility formula down a column of data and noticed that volatility was changing over time. Don't worry, I'm not about to go on a history lesson on cryptocurrencies with details of where David Chaum went to college. Next, calculate the standard deviation over the same number of periods as the simple moving average.

## Introduction

These interactive technical analysis tools can be created and customized to suit your needs and preferences. Stocks that meet the criteria for each of the four trading methods.

Updated on a daily basis for both long and short positions. Read about the four Methods here. An extensive stock-screening program. Customize searches to fit your own criteria. Create a customized portfolio so you can review your holdings at a glance. Educational products Bollinger on Bollinger Bands is the only complete guide for how to trade with Bollinger Bands and that fully explains the Methods in detail. We know that markets trade erratically on a daily basis even though they are still trading in an uptrend or downtrend.

Technicians use moving averages with support and resistance lines to anticipate the price action of a stock. Upper resistance and lower support lines are first drawn and then extrapolated to form channels within which the trader expects prices to be contained.

Some traders draw straight lines connecting either tops or bottoms of prices to identify the upper or lower price extremes, respectively, and then add parallel lines to define the channel within which the prices should move. As long as prices do not move out of this channel, the trader can be reasonably confident that prices are moving as expected. If the price deflects off the lower band and crosses above the day average the middle line , the upper band comes to represent the upper price target.

In a strong uptrend, prices usually fluctuate between the upper band and the day moving average. When that happens, a crossing below the day moving average warns of a trend reversal to the downside. Bollinger Bands are a type of price envelope developed by John Bollinger.

Price envelopes define upper and lower price range levels. Bollinger Bands are envelopes plotted at a standard deviation level above and below a simple moving average of the price. Because the distance of the bands is based on standard deviation, they adjust to volatility swings in the underlying price. The default values are 20 for period, and 2 for standard deviations, although you may customize the combinations.

Bollinger bands help determine whether prices are high or low on a relative basis. They are used in pairs, both upper and lower bands and in conjunction with a moving average.

Further, the pair of bands is not intended to be used on its own. Use the pair to confirm signals given with other indicators.

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