A new model - the factorial hidden Markov volatility (FHMV) model - is proposed for financial returns and their latent variances. It is also applicable to model directly realized variances. Volatility is modeled as a product of three components: a Markov chain driving volatility persistence, an...

This paper discusses risk-minimizing hedging strategies under affine GARCH models driven by Gaussian innovations. First, we derive a closed-form expression for an optimal hedge ratio under this model that is applicable to European derivatives with payoff functions that admit an inverse Laplace...