http://www.sitmo.com/eq/409
Historical Open-High-Low-Close Volatility: Garman and Klass (Yang Zhang)
Submitted by loner on 20 September, 2009 - 1:16amYang and Zhang derived an extension to the Garman Glass historical volatility estimator that allows for opening jumps. It assumes Brownian motion with zero drift. This is currently the preferred version of open-high-low-close volatility estimator for zero drift and has an efficiency of 8 times the classic close-to-close estimator. Note that when the drift is nonzero, but instead relative large to the volatility, this estimator will tend to overestimate the volatility.
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What did I say then?
On Default Correlation: A Copula Function Approach (1 year 5 weeks ago):
This paper studies the problem of default correlation. We first introduce a random variable calle...
