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See moving averages, mad, mse, mape here. In this video, you will learn how to calculate forecast using simple moving average and weighted methods. This video shows how to calculate exponential smoothing and the mean squared error.
In this video, you will learn how to find out the 3 month and 4 monthly moving average for demand forecasting. In this video, you will learn how to find the demand forecast using linear regression.
In this video, you will learn how to find out the forecast when historical data has a trend. This video shows how to calculate moving averages, and forecast error measures. The mean absolute deviation or (mad mae) squared (mse.