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Florian Bourgey and Julien Guyon introduce a novel discrete-time-continuous-time exact calibration method. They build an S&P 500/VIX jointly calibrated discrete-time model, which they later extend to continuous time by martingale interpolation. The benefit of this technique is that both steps can be made much faster than the known methods that calibrate a continuous-time model directly
In previous work, Guyon (2020, 2024) showed how to build a nonparametric discrete
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