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Bollinger bands are technical analysis tools used by forex (i.e. Foreign Exchange) traders. Consider the exchange rate between two currencies plotted on a graph (with time on the horizontal axis)

Add a 20-day moving average, and lines that are two standard deviations above and below the moving average. These are Bolinger Bands.

Most exchanger rate moving will be between these two bands. Generally, when the exchanger rate hits the top band, it's likely to go down, and if it hits the lower band, it's likely to go down.

Traders use this information (together with other indicators) to decide when to buy or sell currencies.

See the Excel spreadsheet in the related link for a spreadsheet that plots Bollinger Bands.

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14y ago

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