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To convert a 1992-based index to a 1997 base, just look for the appropriate rebasing factor in the following tables and multiply each element of the series by that factor. Expressed as a formula, the calculation is:
where Pt/97 is the 1997-based index, f is the rebasing factor and Pt/92 is the 1992-based index.
Conversely, to convert the 1997-based index to a 1992 base, just look for the appropriate rebasing factor in the following tables and divide each element of the series by that factor. Expressed as a formula, the calculation is: