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volatility calculation instructions: Original post by Shula Asher Silberstein of Demand Media The volatility of a stock is an important measure to consider if you want to invest in the stock market. If a stock's value is unstable -- in other words, if the stock keeps going up and down -- you aren't guaranteed much of a return on your investment. To determine whether a stock is a good investment, check its history. Stocks with several…

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