Term	Fisher Ideal Index
Synonym
Related Term
Source of Definition
Short Definition
Statistical Activity	Inflation measures

Definition
The Fisher ‘Ideal’ index is the geometric mean of the Laspeyres and Paasche indexes. It requires the same data as a Paasche index, so it is generally impracticable to use if a timely indicator of price change is required. Statistics New Zealand uses a form of the Fisher ‘Ideal’ formula for its external trade indexes, because timely data on total import and export volumes for a given period are available at the same time as value information is provided by the Customs Department.
(c.f. Laspeyres, Paasche, Marshall-Edgeworth, Tornqvist indexes)

Formula



Example