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The persistent nature of equity volatility is investigated by means of a multi-factor stochastic volatility model with time varying parameters. The parameters are estimated by means of a sequential matching procedure which adopts as auxiliary model a time-varying generalization of the HAR model...
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fraction of the time otherwise required. The proposed method is a two-step procedure, separating the estimation of the … optimization problem can be solved efficiently in the context of the model. A simulation study and an application to stock returns …
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