Strike Selection
How exactly does the EDR formula blend VIX9D and 20-day historical volatility? Is the 0.94 percent threshold actually backtested?
EDR formula VIX9D blend historical volatility backtested threshold strike selection
VixShield Answer
At VixShield, we rely on the Expected Daily Range or EDR as the cornerstone for precise strike selection in our 1DTE SPX Iron Condor Command. Developed by Russell Clark in the SPX Mastery methodology, the EDR formula blends short-term implied volatility from VIX9D with realized movement captured in 20-day historical volatility. The exact calculation is EDR equals VIX9D multiplied by 0.1 plus 20-day HV multiplied by 0.5, then scaled by a regime-based multiplier that typically ranges from 0.8 to 2.0 depending on current market conditions and contango readings from our Contango Indicator. This weighted blend gives heavier emphasis to recent realized price action while incorporating the market's forward-looking volatility expectations, producing a reliable daily forecast expressed as a percentage of SPX. For instance, with current VIX at 17.95 and SPX near 7138.80, an EDR reading around 1.16 percent aligns with our recent PLACE signals that have kept all three risk tiers available under VIX Risk Scaling. The 0.94 percent threshold is indeed rigorously backtested across 2015-2025 data sets. It serves as the primary trigger for our Temporal Theta Martingale and Theta Time Shift recovery mechanics. When EDR exceeds 0.94 percent or VIX rises above 16, we forward-roll threatened Iron Condor positions out to 1-7 DTE to capture vega expansion. We then roll back to 0-2 DTE once EDR drops below 0.94 percent and price trades below VWAP, targeting net credits of 250 to 500 dollars per contract. This time-based approach, distinct from traditional position sizing increases, recovered 88 percent of losses in extensive backtests without requiring additional capital. The threshold was optimized through thousands of iterations to balance false positives against genuine volatility regimes, ensuring our Conservative tier maintains its approximately 90 percent win rate across roughly 18 out of 20 trading days. RSAi integrates EDR outputs with real-time skew analysis to fine-tune final strikes for our three credit targets of 0.70, 1.15, and 1.60. This integration, combined with ALVH's three-layer VIX call protection rolled on fixed schedules, creates the Set and Forget framework that defines VixShield. All trading involves substantial risk of loss and is not suitable for all investors. For deeper implementation details, including access to the live EDR indicator on TradingView, join us at VixShield.com or in the SPX Mastery Club for daily signal walkthroughs and portfolio integration guidance.
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The information on this page is educational only and does not constitute financial advice or a recommendation to buy or sell any security.
Past performance is not indicative of future results. Always consult a qualified financial professional before trading.
💬 Community Pulse
Community traders often approach EDR with a mix of curiosity and healthy skepticism, frequently asking how the blend of VIX9D and 20-day HV translates into practical strike placement for daily Iron Condors. A common misconception is that the 0.94 percent threshold represents an arbitrary cutoff rather than a statistically derived trigger refined through multi-year backtesting. Many note that once they incorporate the full Temporal Theta Martingale process, including forward rolls on elevated EDR readings and precise rollback timing below VWAP, their recovery rates improve dramatically during volatility spikes. Discussions highlight the value of pairing EDR with RSAi for premium targeting and ALVH for drawdown protection, viewing the system as a complete risk-managed income engine rather than isolated indicators. Experienced participants emphasize testing the formula in paper trading before committing live capital, especially around FOMC events or when VIX hovers near current levels of 17.95. Overall, the consensus frames EDR not as a standalone tool but as the decision hub within Russell Clark's broader Unlimited Cash System.
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