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The Hedonic Country Product Dummy Method and Quality Adjustments for Purchasing Power Parity Calculations

  • Mick Silver

The 2005 International Comparison Program's (ICP) estimates of economy-wide purchasing power parity (PPP) are based on parity estimates for 155 basic expenditure headings, mainly estimated using country product dummy (CPD) regressions. The estimates are potentially inefficient and open to omitted variable bias for two reasons. First, they use average prices across outlets as the left-hand-side variable. Second, quality-adjusted prices of non-comparable replacements, required when products in outlets do not match the required specifications, cannot be effectively included. This paper provides an analytical framework based on panel data and hedonic CPD regressions for ameliorating these sources of bias and inefficiency.

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Paper provided by International Monetary Fund in its series IMF Working Papers with number 09/271.

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Length: 28
Date of creation: 01 Dec 2009
Date of revision:
Handle: RePEc:imf:imfwpa:09/271
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  1. W. E. Diewert & Mick Silver & Saeed Heravi, 2007. "Hedonic Imputation versus Time Dummy Hedonic Indexes," IMF Working Papers 07/234, International Monetary Fund.
  2. Baltagi, Badi H. & Bresson, Georges & Pirotte, Alain, 2003. "Fixed effects, random effects or Hausman-Taylor?: A pretest estimator," Economics Letters, Elsevier, vol. 79(3), pages 361-369, June.
  3. W. Erwin Diewert, 1999. "Axiomatic and Economic Approaches to International Comparisons," NBER Chapters, in: International and Interarea Comparisons of Income, Output, and Prices, pages 13-107 National Bureau of Economic Research, Inc.
  4. Baltagi, Badi H & Levin, Dan, 1986. "Estimating Dynamic Demand for Cigarettes Using Panel Data: The Effects of Bootlegging, Taxation and Advertising Reconsidered," The Review of Economics and Statistics, MIT Press, vol. 68(1), pages 148-55, February.
  5. Christos Ioannidis & Mick Silver, 1999. "Estimating exact hedonic indexes: An application to UK television sets," Journal of Economics, Springer, vol. 69(1), pages 71-94, February.
  6. Saeed Heravi & Alan Heston & Mick Silver, 2003. "Using Scanner Data to Estimate Country Price Parities: A Hedonic Regression Approach," Review of Income and Wealth, International Association for Research in Income and Wealth, vol. 49(1), pages 1-21, 03.
  7. Silver, Mick & Heravi, Saeed, 2005. "A Failure in the Measurement of Inflation: Results From a Hedonic and Matched Experiment Using Scanner Data," Journal of Business & Economic Statistics, American Statistical Association, vol. 23, pages 269-281, July.
  8. Viliam Druska & William C. Horrace, 2004. "Generalized Moments Estimation for Spatial Panel Data: Indonesian Rice Farming," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 86(1), pages 185-198.
  9. Evans, William N & Froeb, Luke M & Werden, Gregory J, 1993. "Endogeneity in the Concentration-Price Relationship: Causes, Consequences, and Cures," Journal of Industrial Economics, Wiley Blackwell, vol. 41(4), pages 431-38, December.
  10. Chen, Yi Vivian & Heston, Alan & Lipsey, Robert, 2000. "International and interarea comparisons of income, output and prices," Journal of Asian Economics, Elsevier, vol. 11(3), pages 363-364, December.
  11. 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 WP032004, School of Economics, University of Queensland, Australia.
  12. Ernst R. Berndt & Neal J. Rappaport, 2001. "Price and Quality of Desktop and Mobile Personal Computers: A Quarter-Century Historical Overview," American Economic Review, American Economic Association, vol. 91(2), pages 268-273, May.
  13. Mary F. Kokoski & Brent R. Moulton & Kimberly D. Zieschang, 1999. "Interarea Price Comparisons for Heterogeneous Goods and Several Levels of Commodity Aggregation," NBER Chapters, in: International and Interarea Comparisons of Income, Output, and Prices, pages 123-169 National Bureau of Economic Research, Inc.
  14. Dhrymes, Phoebus J. & Lleras-Muney, Adriana, 2006. "Estimation of models with grouped and ungrouped data by means of "2SLS"," Journal of Econometrics, Elsevier, vol. 133(1), pages 1-29, July.
  15. Sickles, Robin C., 2005. "Panel estimators and the identification of firm-specific efficiency levels in parametric, semiparametric and nonparametric settings," Journal of Econometrics, Elsevier, vol. 126(2), pages 305-334, June.
  16. Moulton, Brent R., 1986. "Random group effects and the precision of regression estimates," Journal of Econometrics, Elsevier, vol. 32(3), pages 385-397, August.
  17. Ariel Pakes, 2003. "A Reconsideration of Hedonic Price Indexes with an Application to PC's," American Economic Review, American Economic Association, vol. 93(5), pages 1578-1596, December.
  18. J. R. Cuthbert & M. Cuthbert, 1988. "On Aggregation Methods of Purchasing Power Parities," OECD Economics Department Working Papers 56, OECD Publishing.
  19. Teekens, R & Koerts, J, 1972. "Some Statistical Implications of the Log Transformation of Multiplicative Models," Econometrica, Econometric Society, vol. 40(5), pages 793-819, September.
  20. Mick Silver & Saeed Heravi, 2006. "Why Elementary Price Index Number Formulas Differ: Price Dispersion and Product Heterogeneity," IMF Working Papers 06/174, International Monetary Fund.
  21. 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, vol. 51(4), pages 571-580, December.
  22. Baltagi, Badi H., 1981. "Pooling : An experimental study of alternative testing and estimation procedures in a two-way error component model," Journal of Econometrics, Elsevier, vol. 17(1), pages 21-49, September.
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