When analysing the volatility related to high frequency financial data, mostly non-parametric approaches based on … stochastic volatility. Estimation of the model delivers measures of daily variation outperforming their non …

We introduce a statistical test for simultaneous jumps in the price of a financial asset and its volatility process … volatility jumps, we design and analyze a nonparametric spectral estimator of the spot volatility process. A simulation study and … important role played by price volatility co-jumps. …

Default probability is a fundamental variable determining the credit worthiness of a firm and equity volatility … choosing different non parametric equity volatility estimators on default probability evaluation, when market microstructure … noise is considered. A general stochastic volatility framework with jumps for the underlying asset dynamics is defined …