Having looked at HYG options for years, it's my impression that the ratio of implied vol to historical vol tends to be especially high, perhaps because there aren't too many ways for retail traders to trade credit vol. Are there other ETF for which the IV/HV tends to be higher than for SPY? To test this you need historical daily implied vols. Some vendors I know of are IVolatility and OptionMetrics.
Interesting pursuit! My back of the napkin observations of a few tickers: Looking at prior 5 year daily data... Symbol avgRV avgIV %timeIV>RV HYG 6.62% 10.13% 89.24% SPY 17.61% 20.7% 73.23% TLT 14.3% 15.5% 67.59% TSLA 60.23% 68.61% 70.37% AAPL 30.25% 32.84% 65.45% QQQ 22.81% 25.26% 68.94% BOIL 92.82% 97.31% 62.51% UVXY 104% 133% 77.8% BABA 42.35% 44.7% 62.83% This obtained via TOS and a thinkscript I wrote
Ah! you are paying attention! Good eye. YES! See partial response below from my script info. # #hint:<b>Realized Future Volatility VS Implied Volatility:</b>\n Shift Anualized Historical Volatility to produce Realized Future Anualized Volatility for period X Bars corresponding to IV reference DTE calendar days.\nCompare this with the Implied Volatility \nTerminate the evauation on the right when future data required. \nDisplay the Average HV, Average IV, and average % of IV premium (value to result in match to Realized Future Volatility!\n # HVol: Historic (Statistical) Volatility
Thanks. I see Thinkorswim has good historical options data. It's part of TD Ameritrade, now owned by Schwab. I have a Schwab account, but I don't see such data on the Schwab site. The TD Ameritrade and Schwab platforms are supposed to be unified in 2023. For now it looks like I need need a TDA account to get the options data. Any other retail brokerages with good historical options data? I have an Interactive Brokers account.