Msm.hs implements Markov-switching Multifractal model volatility simulator.
The algorithm has been proposed in Calvet-Fisher paper "How to Forecast Long-Run Volatility: Regime Switching and the Estimation of Multifractal Processes". (<http://jfec.oxfordjournals.org/content/2/1/49.full.pdf)
Function argument names corespond to those used in paper above.