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I want to compare volatility models from constant volatility, implied, time-varying (ARCH, etc) and stochastic volatility.

I can find the process to calculate constant, implied and ARCH and GARCH volatility but I do not know how to calculate the parameters for Stochastic Volatility models, what is the process for that? I want to draw a graph for each of them but first I need to to know how to calculate these parameters, would you please give me some information?

Thanks a lot.

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possible duplicate of Stochastic Volatility for Stocks, FTSE –  Bob Jansen May 5 '14 at 12:49

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