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EFFICIENT ESTIMATION OF INTEGRATED VOLATILITY FUNCTIONALS UNDER GENERAL VOLATILITY DYNAMICS

Published online by Cambridge University Press:  17 July 2020

Jia Li*
Affiliation:
Duke University
Yunxiao Liu
Affiliation:
University of North Carolina at Chapel Hill
*
Address correspondence to Jia Li, Department of Economics, Duke University, Durham, NC 27708, USA; e-mail: jl410@duke.edu.
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Abstract

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We provide an asymptotic theory for the estimation of a general class of smooth nonlinear integrated volatility functionals. Such functionals are broadly useful for measuring financial risk and estimating economic models using high-frequency transaction data. The theory is valid under general volatility dynamics, which accommodates both Itô semimartingales (e.g., jump-diffusions) and long-memory processes (e.g., fractional Brownian motions). We establish the semiparametric efficiency bound under a nonstandard nonergodic setting with infill asymptotics, and show that the proposed estimator attains this efficiency bound. These results on efficient estimation are further extended to a setting with irregularly sampled data.

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ARTICLES
Copyright
© Cambridge University Press 2020