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Factor & style rotation (factor/style ETFs) · 2026-08-22

Value–Growth Relative-Value Reversion

fade stretched style spreads back toward their mean

expected Sharpe 0.3–0.7confidence: low–mediumfree daily data

Style leadership between value and growth is strongly cyclical and overshoots; the log price ratio of a value ETF to a growth ETF is a stationary-looking spread that tends to snap back after extreme moves, giving a mean-reversion edge distinct from (and negatively correlated to) trend-following the same pair. This is a reversion mechanic, not the excluded factor-momentum ranking.

Universe

Value vs growth style ETF pair — IWD/IWF (Russell 1000 value/growth), plus RPV/RPG (pure-style S&P 500) as a second, higher-beta pair.

How it works

Daily, compute z-score of log(IWD/IWF) vs its 6-month mean/stdev; when z < -1 go long IWD short IWF (value cheap), when z > +1 flip, exit inside ±0.25; size to constant spread vol.

Expected performance

Research-derived Sharpe estimate: 0.3–0.7.

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 Long-short IWD vs IWF (and RPV/RPG) on 6-month z-score of the log price ratio, mean-reversion bands entry ±1 exit ±0.25 Get SignalChain — $49 →

Research & sources

More Factor & style rotation (factor/style ETFs) ideas

Defensive Factor Switch (Low-Vol vs High-Beta)
ride high-beta in calm markets, hide in low-vol when volatility spikes
Macro-Cycle Factor Rotation
tilt to cyclical factors in expansions, defensive factors in slowdowns, using cross-asset
Volatility-Managed Factor Overlay
scale total factor exposure inversely to each factor's own realized variance
Factor Breadth Participation Rotation
let the share of factors in uptrends decide offensive vs defensive tilt

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.