IV/HV ratio 1.0 [dime]This script compares the implied volatility to the historic volatility as a ratio.  
The plot indicates how high the current implied volatility for the next 30 days is relative to the actual volatility realized over the set period.   This is most useful for options traders as it may show when the premiums paid on options are over valued relative to the historic risk. 
The default is set to one year (252 bars) however any number of bars can be set for the lookback period for HV. 
The default is set to VIX for the IV on SPX or SPY but other CBOE implied volatility indexes may be used.  For /CL you have OVX/HV and for /GC you have GVX/HV.
Note that the CBOE data for these indexes may be delayed and updated EOD
and may not be suitable for intraday information. (Future versions of this script may be developed to provide a realtime intraday study. ) 
There is a list of many volatility indexes from CBOE listed at:
www.cboe.com
(Some may not yet be available on Tradingview)
 RVX Russell 2000 
 VXN  NASDAQ 
 VXO  S&P 100 
 VXD  DJIA 
 GVX Gold 
 OVX  OIL
 VIX3M  3-Month  
 VIX6M	S&P 500 6-Month  
 VIX1Y	1-Year  
 VXEFA	Cboe EFA ETF 
 VXEEM	Cboe Emerging Markets ETF   
 VXFXI	Cboe China ETF   
 VXEWZ	Cboe Brazil ETF  
 VXSLV	Cboe Silver ETF 
 VXGDX	Cboe Gold Miners ETF 
 VXXLE	Cboe Energy Sector ETF 
 EUVIX	FX Euro 
 JYVIX	FX Yen 
 BPVIX	FX British Pound 
 EVZ	Cboe EuroCurrency ETF Volatility Index
 Amazon VXAZN
 Apple VXAPL
 Goldman Sachs  VXGS
 Google VXGOG
 IBM VXIBM
