What Is VIX1D? The 1-Day Volatility Index
VIX1D measures expected S&P 500 movement over the current trading day, priced from 0DTE SPX options. Why a reading of 20 there is not the same as a VIX of 20.
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How the Put/Call Ratio Is Calculated
How the put/call ratio is calculated: the volume and open interest formulas, why index readings run higher, and what counts as a normal reading in 2026.