Glossary term
Walk-Forward Test
Repeatedly refitting a strategy on past data and evaluating it on later unseen data.
A walk-forward test tries to mimic live research. The model or rule parameters are chosen using a historical training window, then tested on the next period. The window advances and the process repeats.
Example: A strategy might train on 10 years of SPY history, trade the next 6 months in simulation, then roll forward and repeat.