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The practice of fixing the results of an International Comparison Programme (ICP) aggregation for a country group when the country group is compared with a larger group. For example, the relation of France and Italy as given by Geary-Khamis or EKS for the 15 EU countries would be fixed so that within OECD, the France-Italy relationship would be preserved.

When results are calculated originally for a group of countries and then later the results are calculated for a wider group of countries, the PPPs between the original group of countries shall nevertheless be preserved.

The convention whereby the price and volume relativities between a group of countries that were established in a comparison covering just that group of countries remain unchanged, or fixed, when the countries of the group are included in comparisons with a wider group of countries.

For example, the price and volume relativities for EU Member States established by Eurostat remain unchanged when the EU Member States are included in a comparison covering OECD Member Countries.

If fixity was not observed, there would be two sets of results for EU Member States. The two set would not necessarily be in agreement because the relative position of countries can change as the composition of the group of countries being compared changes. Fixity ensures that Eurostat, the OECD and participating countries have only one set of results to explain to users.

Eurostat, OECD, 2007, Eurostat-OECD Methodological Manual on Purchasing Power Parities, OECD, Paris – Annex VII, Glossary of terms and abbreviations.

Source Publication:
Handbook of the International Comparison Programme, Studies in Methods, Series F, No. 62, United Nations Department of Economic and Social Development, Statistical Division, New York, 1992, Glossary.


Statistical Theme: Prices and purchasing power partities

Created on Thursday, February 6, 2003

Last updated on Thursday, July 12, 2007