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Walk-Forward Validation for Time Series Quiz

Test forecast origins, rolling and expanding windows, and time-based leakage in realistic walk-forward evaluation and feature workflows.

Wadooyinka haga ee la xidhiidhaWalk Forward Validation For Time Series
Su'aal 1 ee 8

A monthly model trains through June and forecasts July. In an expanding-window evaluation, which history is used for the next August forecast?