The components of the time series. 1. trend (Long Term Trend: T) trend is the movement or change of the information in the long run, such as the power consumption of the country Thailand, the import volume of crude oil, etc. 2. the value of a variable by season (Seasonal Variation: S) refers to the change in season, by repeated in round 1 last year until he made the same plans, such as the rice output in the first quarter of the year, sales of the Department in the late years, etc. In an analysis of the seasonal variation of this measure in the form of seasonal index (Seasonal Index). 3. the variable values by wat machine (Cyclical Variation: C) refers to the movement that was to follow wat machinery (such as business machines, wat) wat this machine-based animation is similar to the seasonal variation, but there will be a period of time longer than the. 4. the variable because the events are not normal (Irregular Variation: I) a variable of this type. Cannot be predicted in advance.
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