H
Hongzhong Zhang
Researcher at Columbia University
Publications - 63
Citations - 1003
Hongzhong Zhang is an academic researcher from Columbia University. The author has contributed to research in topics: Optimal stopping & Drawdown (economics). The author has an hindex of 16, co-authored 58 publications receiving 885 citations. Previous affiliations of Hongzhong Zhang include City University of New York.
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One Shot Schemes for Decentralized Quickest Change Detection
TL;DR: It is shown that there is no loss of performance of one shot schemes as compared to the centralized case in an extended Lorden min-max sense, since the minimum of N CUSUMs is asymptotically optimal as the mean time between false alarms increases without bound.
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Asymptotics for Rough Stochastic Volatility Models
Martin Forde,Hongzhong Zhang +1 more
TL;DR: The large deviation principle (LDP) is used for a rescaled fractional Brownian motion and it is shown that $t^{H-\frac{1}{2}} \log S_t $ satisfies the LDP as $t\to0$ and the model has a well-defined implied volatility smile.
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Maximum drawdown insurance
TL;DR: In this paper, double barrier options are proposed as hedges for both kinds of insurance against large maximum drawdown, and the second kind of hedge is model-free for both types of hedges.
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On magnitude, asymptotics and duration of drawdowns for Lévy models
TL;DR: In this article, the authors considered magnitude, asymptotics and duration of drawdown for some L´evyprocesses and derived the time to recover (TTR) the historical max-imum.
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Drawdowns and the Speed of Market Crash
TL;DR: In this paper, the authors derived the joint Laplace transform of the last visit time of a process preceding the drawdown, the speed of market crash, and the maximum of the process under general diffusion dynamics.