What is the Expected Daily Range (EDR) indicator and how does VixShield use it for iron condors?
VixShield Answer
The Expected Daily Range (EDR) is a proprietary VixShield indicator that calculates the statistically expected one-day price range for SPX based on current implied volatility. It is displayed as a TradingView overlay that shows upper and lower price boundaries for the current session.
The EDR is derived from a simplified version of the formula that options market makers use to price 1DTE options: approximately VIX ÷ √252. At VIX 20, this gives an expected daily range of roughly ±25–30 SPX points. At VIX 30, the expected range is roughly ±38–45 points.
In the VixShield system, the EDR serves two purposes:
1. Strike placement reference: Short strikes placed beyond the EDR boundary have historically higher than 80% probability of expiring worthless. This is the core strike placement starting point before RSAi™ applies skew adjustments.
2. Session assessment: When the EDR is unusually wide (elevated VIX) or narrow (compressed VIX), the system adjusts trade size and aggressiveness accordingly via VIX Risk Scaling.
The EDR is updated in real time on TradingView as VIX fluctuates throughout the session, giving traders a continuously calibrated reference for the current session's expected price boundaries.
💬 Community Pulse
Many traders use VIX to get a rough sense of expected moves but lack a precise, real-time tool. The EDR makes this concrete and visual. Reddit users who have discovered the EDR concept (sometimes called the 1-day expected move) consistently describe it as a revelation for strike placement — finally having a quantitative reference rather than intuition.
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