However, fast forward ten years to , and 1 GBP now only buys 1. This makes my still necessary trips to North America much more expensive, and things no longer seem like a bargain. This means I have to keep a much closer eye on the exchange rate in order to balance my budget. But how do I know this? The first step is to locate historical exchange rates.

There are many websites that give you this data for any two currencies. I like Oanda. But there are three more lines on the chart. Bollinger Bands are equivalent to the day moving average plus or minus two standard deviations.

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Similar to the stock market, there are times in which Forex rates change rapidly. This is known as volatility. During periods of volatility the Bollinger bands move further apart, and vice-versa when the market is stable. Now, some professional forex traders have drawn the conclusion that bands that get narrower indicate that the market will become more volatile in the future, while bands that get wider mean that the market will become less volatile in the future.

This allows them to make instant trading decisions, taking advantage of small pricing movements. Another useful indicator is the Bollinger Squeeze. Bollinger bands are remarkably easy to create in Excel.

You can download the Excel spreadsheet I used to create the charts above by clicking here. I do not find a downloadable Bollinger band code on this page should it be here? The sample computes the Bollinger Band from a day simple moving average. It also computes the Bollinger Band from day exponential moving average. The application also includes an Excel spreadsheet that displays the bands, plotting them automatically. An sbfeedsim configuration file, BollingerBand. An feed simulation data file, BollingerBand.

In the Package Explorer, double-click to open the BollingerBand. Make sure the application is the currently active tab in the EventFlow Editor. Click the Run button. Select the BollingerBand. When done, press F9 or click the Stop Running Application button.

Open three terminal windows. In each window, navigate to the directory in your Studio workspace that contains your copy of this sample. In window 2, enter the following command to dequeue tuples from the server's output streams:.

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In window 3, run sbfeedsim on the provided configuration file, suppressing the printout of tuples. Then run sbadmin shutdown to close the server. Open three StreamBase Command Prompt s.

In window 3, run sbfeedsim on the provided configuration file, suppressing the printout of tuples:. When you load the sample into StreamBase Studio, Studio copies the sample project's files to your Studio workspace, which is normally part of your home directory, with full access rights. Load this sample in StreamBase Studio, and thereafter use the Studio workspace copy of the sample to run and test it, even when running from the command prompt.

Using the workspace copy of the sample avoids the permission problems that can occur when trying to work with the initially installed location of the sample. The default workspace location for this sample is:. See Default Installation Directories for the location of studio-workspace on your system.

See Default Installation Directories for the location of streambase-install-dir on your system. This location may require administrator privileges for write access, depending on your platform.

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