“…The results are promising. Although a large majority of studies focus on volatility forecasting through neural network techniques, deep learning, and support vector machines (i.e., Tang et al, 2009;Chen et al, 2010;Pradeepkumar & Ravi, 2017;Liu, 2019;Gon et al 2019), there is a smaller number of publications associated with proposals for volatility calibration (Zeng & Klabjan, 2019;Horvath et al, 2021), options valuation (Amornwattana et al, 2007;Fadda, 2020;Jerbi, & Chaabene, 2020), projects valuation ( Jang et al, 2021), and some theoretical works related to stochastic processes and their use in volatility issues (Peng & Liu, 2011).…”