Statistical Terms

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Definition	It could be one week, one month or the average of a group of years. In Korea, it is customary to revise the base period every 5 years and the base period for price and industrial production index is set to years (Anno Domini) in multiples of 5.
Commentary	The period of time for which data used as the base of an index number have been collected. This period is frequently specified in particular years.
Source	KOSTAT (Understanding of Statistical Terms)