The description on Bloomberg website here is actually somewhat misleading: "The AlphaShares Chinese Volatility Index measures the implied volatility of options on the FTSE Xinhua China 25 and Hang Seng (HSI) indices." In a private email Alphashares representative explained that the index is an equal-weighted average of ATM volatilities of FXI ETF (US) and HSI (HK) .
Over the last five years VIX and CHIX moved in tandem, with CHIX about 1.5 times the VIX. However in the last 3 months this ratio fell below 1, with CHIX trading below VIX.
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