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Validating a forecasting model

You are building a model to predict next week sales from past sales. Which validation approach is correct?

A.Shuffle all rows and use 5-fold cross-validationB.Use leave-one-out cross-validation on shuffled dataC.Use the most recent data for training and older data for validationD.Use forward-chaining splits: train on the past, validate on the period right after

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Validating a forecasting model

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