Common Base Charts
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Viewing Price Changes in Percentages
The Common Base function displays the closing prices for a security in terms of percentages, with the initial price in the selected chart period set to 100% (for intraday charts, the closing price is taken to be the last price at which a transaction in a security took place). This function is particularly useful when comparing securities.
The screen shot below charts the SGB security price with the initial price starting at 100%.

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