Home / Ideas / Dispersion-Conditioned Relative-Value Reversion (Sector vs Index)
Dispersion-Conditioned Relative-Value Reversion (Sector vs Index)
fade sector ETFs that overshoot their index during high-dispersion regimes
A targeted play on the exact current regime: with implied correlation near theoretical lows, individual sectors detach sharply from the index (semis -9% while banks +1.5% in the same week), then partially revert as correlation normalizes. Trading each sector ETF's spread versus SPY captures this relative-value snap-back, a lightweight cross-sectional stat-arb.
Why it's relevant now
1-month implied correlations at ~3–4 (lowest since July 2024) and extreme sector dispersion are the explicit setup — this idea is most alive precisely when the regime looks like it does today, and should be de-risked when correlation normalizes.
Universe
The 11 SPDR sector ETFs (XLK, XLF, XLE, XLV, XLI, XLY, XLP, XLU, XLB, XLRE, XLC) vs SPY. Free daily OHLCV.
How it works
Compute each sector's rolling return spread vs SPY, z-score it over ~20 days; long the 2–3 sectors with the most negative z-scores and short the 2–3 most positive (dollar-neutral), rebalance every few days, scale exposure down when a rolling correlation/dispersion proxy is not elevated.
Expected performance
Research-derived Sharpe estimate: 0.4–0.9. regime-dependent; wide band, single-regime evidence — treat as a tactical overlay, not an all-weather system).
Backtest this idea with SignalChain
This is a research lead — not a finished backtest. SignalChain takes an idea like this and runs the whole pipeline inside Claude Code: it researches the concept against academic and practitioner sources, sets benchmarks, writes and lints a VectorBT backtest, runs it, and grades the result PASS/FAIL. One command:
/signalchain Dollar-neutral sector-vs-index mean reversion on SPDR sector ETFs: z-score each sector's 20-day return spread versus SPY, long most negative, short most positive, scale down when dispersion is low.
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Research & sources
- volvibes.substack.com — volvibes.substack.com
- omegapoint.ai — omegapoint.ai
- alphaarchitect.com — alphaarchitect.com
More mean-reversion and statistical arbitrage ideas
Not financial advice. This page describes a research idea, not a recommendation. Any performance figures are hypothetical, research-derived estimates and are not indicative of future results. SignalChain is a research and educational tool; you are solely responsible for any decisions you make.