Hedonic Price Indexes with Unobserved Product Characteristics, and Application to PC's
AbstractWe show that hedonic price indexes may be biased when not all product characteristics are observed. We derive two primary sources of bias. The first is a classical selection problem that arises due to changes over time in the values of unobserved characteristics. The second comes from changes in the implicit prices of unobserved characteristics. Next, we show that the bias can be corrected for under fairly general assumptions using extensions of factor analysis methods. We test our methods empirically using a new comprehensive monthly data set for desktop personal computer systems. For this data we find that the standard hedonic index has a slight upward bias of approximately 1.4\% per year. We also find that omitting an important characteristic (CPU benchmark) causes a large bias in the index with standard methods, but that this bias is essentially eliminated when the proposed correction is applied.
Download InfoIf you experience problems downloading a file, check if you have the proper application to view it first. In case of further problems read the IDEAS help page. Note that these files are not on the IDEAS site. Please be patient as the files may be large.
Bibliographic InfoPaper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 9980.
Date of creation: Sep 2003
Date of revision:
Publication status: published as Benkard, C. Lenair and Patrick Bajari. "Hedonic Price Indexes With Unobserved Product Characteristics," Journal of Business and Economic Statistics, 2005, v23(1,Jan), 61-75.
Note: IO PR
Contact details of provider:
Postal: National Bureau of Economic Research, 1050 Massachusetts Avenue Cambridge, MA 02138, U.S.A.
Web page: http://www.nber.org
More information through EDIRC
Find related papers by JEL classification:
- E3 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles
- C1 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General
This paper has been announced in the following NEP Reports:
- NEP-ALL-2004-07-18 (All new papers)
- NEP-EVO-2003-09-24 (Evolutionary Economics)
- NEP-INO-2003-09-24 (Innovation)
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
- Hansen, Lars Peter, 1982. "Large Sample Properties of Generalized Method of Moments Estimators," Econometrica, Econometric Society, vol. 50(4), pages 1029-54, July.
- Cragg, John G. & Donald, Stephen G., 1997. "Inferring the rank of a matrix," Journal of Econometrics, Elsevier, vol. 76(1-2), pages 223-250.
- Iain M. Cockburn & Aslam H. Anis, 1998.
"Hedonic Analysis of Arthritis Drugs,"
NBER Working Papers
6574, National Bureau of Economic Research, Inc.
- Berry, Steven & Levinsohn, James & Pakes, Ariel, 1995. "Automobile Prices in Market Equilibrium," Econometrica, Econometric Society, vol. 63(4), pages 841-90, July.
- Rosa L. Matzkin, 2003.
"Nonparametric Estimation of Nonadditive Random Functions,"
Econometric Society, vol. 71(5), pages 1339-1375, 09.
- Rosa L. Matzkin, 1999. "Nonparametric Estimation of Nonadditive Random Functions," Working Papers 38, Universidad de San Andres, Departamento de Economia, revised Sep 2001.
- Ohta, Makoto & Griliches, Zvi, 1986. "Automobile Prices and Quality: Did the Gasoline Price Increases Change Consumer Tastes in the U.S.?," Journal of Business & Economic Statistics, American Statistical Association, vol. 4(2), pages 187-98, April.
- Makoto Ohta, 1983. "Automobile Prices and Quality: Did the Gasoline Price Increase Change Consumer Tastes in the U.S.?," NBER Working Papers 1211, National Bureau of Economic Research, Inc.
- G. Christian Ehemann & Brent R. Moulton, 2001. "Balancing the GDP Account," BEA Papers 0014, Bureau of Economic Analysis.
- Robert C. Feenstra & Christopher R. Knittel, 2009.
"Re-Assessing the U.S. Quality Adjustment to Computer Prices: The Role of Durability and Changing Software,"
in: Price Index Concepts and Measurement, pages 129-160
National Bureau of Economic Research, Inc.
- Christopher Knittel & Robert Feenstra, 2006. "Re-Assessing the U.S. Quality Adjustment to Computer Prices: The Role of Durability and Changing Software," Working Papers 632, University of California, Davis, Department of Economics.
- Robert C. Feenstra & Christopher R. Knittel, 2004. "Re-Assessing the U.S. Quality Adjustment to Computer Prices: The Role of Durability and Changing Software," NBER Working Papers 10857, National Bureau of Economic Research, Inc.
- C. Lanier Benkard & Patrick Bajari, 2004. "Demand Estimation with Heterogeneous Consumers and Unobserved Product Characteristics: A Hedonic Approach," NBER Working Papers 10278, National Bureau of Economic Research, Inc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: ().
If references are entirely missing, you can add them using this form.