Walk-forward analysis

A validation method, invented by Robert Pardo, that fits parameters on an in-sample window, applies those frozen parameters to the next out-of-sample window, then rolls both windows forward and repeats, stitching the out-of-sample pieces into one continuous equity curve. Only that out-of-sample curve is treated as believable performance.

First used in Lesson 2.7 · Walk-forward: the honest way to test an optimized system — the lesson that makes this term real.