Which of the following statements are true about time-series forecasting?
a. Time series analysis is based on the idea that the history of occurrences over time can be used to predict the future.
b. Time series analysis tries 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
e. A, B, and C
Which of the following statements are true about time-seri