The chart below graphically represents the calculation for the Cboe’s VIX® with near-real-time (20-minute delayed) data, The actual VIX is located on the black dotted line in the left-center of the graph. Click here for a larger snapshot for 12-Nov-2014. The VIX now uses interpolation between two VIX style calculations (VIN and VIF) on SPX options series that are a week apart—bracketing the 30-day target horizon …
The dynamically updated chart above uses delayed quotes from Google Finance. It details the interpolation / extrapolation process that computes the 30 day VIXMO from two close-in months of SPX options (VINMO and VIFMO). This calculation is the legacy version of the VIX that was used from 23-Sept-2003 through 5-Oct-2014. On October 6th, 2014 the CBOE modified the calculation to start using SPX weekly options …
Update: On October 6th, 2014 the CBOE changed the calculation method for the VIX to include SPX weekly options, the old VIX calculation is still being reported using the VIXMO (VIX Month Only) ticker. The new calculation uses the VIX ticker. For more on the new calculation see “Calculating the New VIX“. The movements of the CBOE’s VIX® are often confusing. It usually moves the opposite …
