Walk-forward validation quick cards
Recall the validation boundaries that keep walk-forward testing honest.
mixed-card-deck acronym-card comparison-card Validation memory TTER What are the four walk-forward boundaries to remember? Train, Tune, Embargo, Roll. Boundary check Tuning data versus testing data If it changes the model, it was tuning, not testing. Objection handler We only looked at the test once before changing the feature. A teammate treats one look as harmless. Your line One look can still steer design. Keep the insight, but relabel that result exploratory and reserve fresh confirmation data. Small leakage is still leakage when it chooses the model. It preserves the research insight without overstating validation strength. Recall
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