Is the engine's edge fading? This reads the nightly walk-forward validator: for each of the five signal factors it compares the Information Coefficient over the full history against the last 60 days, so you can see which factors still predict and which have gone flat — or inverted.
IC (Information Coefficient) is the rank correlation between a factor's score and the realized forward return: positive means the factor ranks winners above losers, near-zero means no edge, negative means it is ranking them backwards. Decay ratio is recent IC ÷ full-history IC. Educational research only — not investment advice.