For instance, in many regions of the U.S. A seasonally adjusted value removes the seasonal effect from a value so that trends can be seen more clearly. One of the main objectives for a decomposition is to estimate seasonal effects that can be used to create and present seasonally adjusted values. Here, we’ll only consider trend and seasonal decompositions. More extensive decompositions might also include long-run cycles, holiday effects, day of week effects and so on. Decomposition procedures are used in time series to describe the trend and seasonal factors in a time series.
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