Term
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| Description |
The period of time for which data used as the base of an index number, or other ratio, have been collected. This period is frequently one year but it may be as short as one day or as long as the average of a group of years (6). |
| Source |
Kendall, Sir Maurice G., and William R. Buckland for the International Statistical Institute (1982). A Dictionary of Statistical Terms, Fourth Edition (London, Longman Group). |
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