One of the disadvantages of a regression-based linear trend forecasting model is that the forecast errors are computed for time periods that were used in developing the forecasting model and thus do not truly measure the forecasting ability of the model.

Question

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The forecast errors computed during the development of a regression-based linear trend forecasting model are based on the same data used to create the model, which means they do not necessarily reflect the model's ability to predict future, unseen data points.

One of the Disadvantages of a Regression-Based Linear Trend Forecasting