Jiang, J. George and Tian,S. Yisong Extracting model free volatility from option prices: an examination of the VIX index 2007 - 2007 - 35 - 60 V. 14 Issue. 3 Subjects--Topical Terms: Derivatives Subjects--Index Terms: Chicago Board options exchange;CBOE;VIX Index;Stock market;Trading;