23) Which of the following statements are true about time-series forecasting?
A. Time series analysis employs empirical data to forecast future events
B. Time series analysis is used to understand the system underlying and surrounding the item being forecast
C. Under time-series methods, demand is divided into the time-based components such as daily, weekly, etc
D. Time series methods are useful for long-range forecasts when the demand pattern is erratic
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acc week