von der Lippe, Peter (2010): The Interpretation of Unit Value Indices  Unit Value Indices as Proxies for Price Indices.

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Abstract
The unit value index (UVI) as compiled in Germany for exports and imports is compared with two other indices, viz. an index of Drobisch which unfortunately is likewise known as "unit value index" and the "normal" Laspeyres price index (PI) of exports and imports. The UVI may be viewed as a Paasche index compiled in two stages where unit values instead of prices are used in the low level aggregation stage. Unit values are average prices referring to an aggregate of (more or less homogeneous) commodities. The focus of the paper is on the decomposition of the discrepancy between UVIs and PIs (the "unit value bias") into a (well known) Laspeyres (or substitution) effect or "Leffect" and a structural component or "Seffect" due to substituting unit values for prices. It is shown that amount and sign of S depends on the correlation between the change of quantities of those goods that are included in the aggregate and their respective base period prices. By contrast to L the correlation between quantity and price movement is not relevant for S. This paper is a revised version of my contribution to the 11th Ottawa Group Meeting in Neuchatel (Switzerland) 27th to 29th May 2009 http://www.ottawagroup2009.ch/
Item Type:  MPRA Paper 

Original Title:  The Interpretation of Unit Value Indices  Unit Value Indices as Proxies for Price Indices 
English Title:  The Interpretation of Unit Value Indices  Unit Value Indices as Proxies for Price Indices 
Language:  English 
Keywords:  Price index, unit value index, unit values, axioms, foreign trade statistics, Bortkiewicz, Drobisch. 
Subjects:  C  Mathematical and Quantitative Methods > C4  Econometric and Statistical Methods: Special Topics > C43  Index Numbers and Aggregation F  International Economics > F1  Trade > F10  General E  Macroeconomics and Monetary Economics > E0  General > E01  Measurement and Data on National Income and Product Accounts and Wealth; Environmental Accounts C  Mathematical and Quantitative Methods > C8  Data Collection and Data Estimation Methodology; Computer Programs > C80  General 
Item ID:  24743 
Depositing User:  Peter von der Lippe 
Date Deposited:  02. Sep 2010 01:04 
Last Modified:  15. Feb 2013 23:25 
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URI:  http://mpra.ub.unimuenchen.de/id/eprint/24743 