By combining the true strength of the Nasdaq (NDX) and S&P500 (SPY) we can then compare that against the volatility /fear index (VIX). The true strength of the Volatility Index (VIX) is shown by the red area and the Nasdaq (NDX) and S&P500 (SPY) by the silver/teal areas.
The yellow EMA line shows the average difference between the VIX and the NDX/SPY indexes....