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Stochastic Approach to Index Numbers for Multilateral Price Comparisons and their Standard Errors

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The main objective of the paper is to demonstrate that a number of widely used multilateral index numbers for international comparisons of purchasing power parities (PPPs) and real incomes can be derived using the stochastic approach. The paper shows that price index numbers from commonly used methods like the Iklé, the Rao-weighted, and an additive multilateral system are all estimators of the parameters of the country-product-dummy (CPD) model. The advantage of the stochastic approach is that we can derive standard errors for the estimates of the purchasing power parities (PPPs). The PPPs and the parameters of the stochastic model are estimated using a weighted maximum likelihood procedure under different stochastic specifications for the disturbance term. Estimates of PPPs and their standard errors for OECD countries using the proposed methods are presented. The paper also outlines a method of moments approach to the estimation of PPPs under the stochastic approach. The paper shows how the Geary-Khamis system of multilateral index numbers is a method of moments estimator of the parameters of the CPD model. The paper therefore provides a coherent stochastic framework for the Geary-Khamis system and derives standard errors of the Geary-Khamis PPPs. Copyright 2010 The Authors. Journal compilation International Association for Research in Income and Wealth 2010.

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File URL: http://www.uq.edu.au/economics/cepa/docs/WP/WP062008.pdf
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Paper provided by School of Economics, University of Queensland, Australia in its series CEPA Working Papers Series with number WP062008.

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Date of creation: 2008
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Handle: RePEc:qld:uqcepa:34

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  1. Erwin Diewert, 2005. "Weighted Country Product Dummy Variable Regressions And Index Number Formulae," Review of Income and Wealth, International Association for Research in Income and Wealth, International Association for Research in Income and Wealth, vol. 51(4), pages 561-570, December.
  2. D. S. Prasada Rao, 2005. "On The Equivalence Of Weighted Country-Product-Dummy (Cpd) Method And The Rao-System For Multilateral Price Comparisons," Review of Income and Wealth, International Association for Research in Income and Wealth, International Association for Research in Income and Wealth, vol. 51(4), pages 571-580, December.
  3. D.S. Prasada Rao, 2004. "The Country-Product-Dummy Method: A Stochastic Approach to the Computation of Purchasing Power Parities in the ICP," CEPA Working Papers Series, School of Economics, University of Queensland, Australia WP032004, School of Economics, University of Queensland, Australia.
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Cited by:
  1. Ludwig Auer, 2012. "Räumliche Preisvergleiche: Aggregationskonzepte und Forschungsperspektiven," AStA Wirtschafts- und Sozialstatistisches Archiv, Springer, Springer, vol. 6(1), pages 27-56, December.

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