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Drift-Independent Volatility Estimation Based on High, Low, Open, and Close Prices

Dennis Yang and Qiang Zhang

The Journal of Business, 2000, vol. 73, issue 3, 477-91

Abstract: We present a new volatility estimator based on multiple periods of high, low, open, and close prices in a historical time series. The new estimator has the following nice properties: it is (a) unbiased in the continuous limit, (b) independent of the drift, (c) consistent in dealing with opening price jumps. Furthermore, it has the smallest variance among all estimators with similar properties. The improvement of accuracy over the classical close-to-close estimator is dramatic for real-life time series. Copyright 2000 by University of Chicago Press.

Date: 2000
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