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AGGREGATION

Statistics Directorate    
French Equivalent: Agrégation

Definition:
Aggregation is the combination of related categories, usually within a common branch of a hierarchy, to provide information at a broader level to that at which detailed observations are taken.

Context:
With standard hierarchical classifications, statistics for related categories can be grouped or collated (aggregated) to provide a broader picture, or categories can be split (disaggregated) when finer details are required and made possible by the codes given to primary observations.

("United Nations Glossary of Classification Terms"; prepared by the Expert Group on International Economic and Social Classifications)

Aggregation denotes the compounding of primary data into an aggregate, usually for the purpose of expressing them in a summary form. For example, national income and price index numbers are aggregative, in contrast to the income of an individual or the price of a single commodity (The International Statistical Institute, “The Oxford Dictionary of Statistical Terms”, edited by Yadolah Dodge, Oxford University Press, 2003).

In the context of PPPs aggregation refers to the procedure of computing PPPs above the basic heading level. The process of weighting, summing and averaging basic heading PPPs to obtain PPPs for each level of aggregation up to and including GDP.

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

Source Publication:
"United Nations Glossary of Classification Terms"; prepared by the Expert Group on International Economic and Social Classifications; unpublished on paper.

Cross References:
Compilation practices
Disaggregation
Special Data Dissemination Standard (SDDS)

Hyperlink:
http://unstats.un.org/unsd/class/family/glossary_short.asp

Statistical Theme: Methodological information (metadata)

Glossary Output Segments:
SDMX
MetaStore

Created on Tuesday, September 25, 2001

Last updated on Monday, June 10, 2013