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A window is a fixed-length subset of consecutive observations of a time series. The window is moved along the time series at a constant rate. AKA "rolling window".

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Rolling vs Recursive vs Fixed Window Regression

Your definitions are correct. Economic Forecastsing - Elliot and Timmerman (2016) is a good ref for that. See the image therein: However I'm still somewhat confused between multi-step ahead forecast …
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