Hello, I have recently been trying to learn about trading the implied volatility. From what I read, IV is supposed to be serial correlated (or autocorrelated). From what I understand, it means that the movement IV will make in the next X days should closely match the mouvement IV has made during the past X days. Do I understand what autocorrelation means? This statement according to which IV is autocorrelated seems to me to be crucial as it leads to believe that predicting Implied Volatility is easier that predicting prices. Now, supposing that predicting IV is easier than predicting prices, then the serial correlation of IV is higher than the serial correlation of prices. I wish to know if some of you have actually calculated the autocorrelation of any IV data? If so, what measure of IV serial correlation have you found? Over what period of time IV serial correlation is highest? Have you compared IV serial correlation to prices serial correlation? What software do you use to do the measurement?