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The aim of this work is to study the relationship between implied and realized volatilities. For this purpose, we analyze the markets of Petrobras stocks and calls between January 2006 and December 2008. Regression analysis with no overlapping monthly data of in-the-money, at-the-money and out-of-the-money calls indicates that the implied volatility of out-of-the-money options contains more information about future volatility than does historical volatility. On the other hand, the implied volatility of the in-the-money and at-the-money calls has poor explanatory

Does implied volatility contain information about future volatility? Evidence from the Petrobras options market