試題詳解

複選題
17. Which of the following descriptions is/are correct about forecasting?
(A) A Naive forecasting method is done without considering any historical data；
(B) When a positive trend exists, the forecasting using moving average method tends to underestimate the true values.
(C) In a simple exponential smoothing method, a higher smoothing factor increases the level of smoothing, making the forecast less responsive to recent changes.
(D) By treating time as the independent variable and the time series as a dependent variable, regression analysis can be used as a time series method.
(E) Time series decomposition can be used to separate or decompose a time series into seasonal, trend, and irregular (error) components.