A statistical measure of core inflation

Meyler, Aidan (1999): A statistical measure of core inflation. Published in: Central Bank and Financial Services Authority of Ireland Technical Paper Series , Vol. 1999, No. 2/RT/1999 (April 1999): pp. 1-43.

Abstract

This paper examines alternative statistically-based measures of core inflation in Ireland over the period 1976-1999. A highly disaggregated (approximately 500 price series) dataset from the Irish HICP is used. The distribution of quarterly price changes is shown, in common with other international studies, to be highly kurtotic (i.e., fat-tailed) and right skewed. This would suggest there is considerable ‘statistical noise’ in the measured inflation rate, motivating the use of ‘limited influence’ estimators of central tendency over the mean measure on the grounds of statistical efficiency. It is found that even a relatively small amount of trim from both ends of the distribution of price changes results in considerable improvement in root mean square error (RMSE) relative to a benchmark measure of core inflation. This improvement is even larger when monthly data are examined.

• Item Type: MPRA Paper
• Language: English
• Keywords: core inflation; trimmed mean; Ireland
• Subjects: E - Macroeconomics and Monetary Economics > E3 - Prices, Business Fluctuations, and Cycles

References

Balke, N. and M. Wynne, 1996. “Supply Shocks and the Distribution of Price Changes”, Federal Reserve of Dallas Economic Review, First Quarter, pp. 10-18.

Ball, L. and G. Mankiw, 1995. “Relative Price Changes As Aggregate Supply Shocks”, Quarterly Journal of Economic Studies, Vol. 110, No. 1, pp. 161-193.

Bank of England, 1996. Inflation Report, February.

Baxter, M., 1997. “Implications of the US Boskin Report for the UK Retail Prices Index”, Economic Trends, No. 527, November, pp. 56-62.

Blinder, A. 1997. “Commentary (on Measuring Short-Run Inflation for Central Bankers)”, Federal Reserve Bank of St. Louis Review, May/June, pp. 157-160.

Boskin, M., E. Dulberger, R. Gordon, Z. Griliches and D. Jorgenson, 1996. “Toward a More Accurate Measure of the Cost of Living”, Final Report to the Senate Finance Committee from the Advisory Commission to Study the Consumer Price Index, Washington D.C.: Senate Finance Committee.

Bryan, M., 1997. “On the Origin and Evolution of the Word Inflation”, Federal Reserve Bank of Cleveland Economic Commentary, October 15.

Bryan, M. and S. Cecchetti, 1999. “The Monthly Measurement of Core Inflation in Japan”, Bank of Japan IMES Discussion Paper Series No. 99-E-4.

Bryan, M. and S. Cecchetti, 1996. “Inflation and the Distribution of Price Changes”, NBER Working Paper Series No. 5793.

Bryan, M., S. Cecchetti and R. Wiggins, 1997. “Efficient Inflation Estimation”, NBER Working Paper Series No. 6183.

Cecchetti, S., 1997. “Measuring Short-Run Inflation for Central Bankers”, Federal Reserve Bank of St. Louis Review, May/June, pp. 143- 155.

Clements, K., and H. Izan, 1987. “The Measurement of Inflation: A Stochastic Approach”, The Journal of Business and Economic Statistics, July, pp. 339-350.

Coimbra, C., and P. Neves, 1997. “Trend Inflation Indicators”, Banco de Portugal Economic Bulletin, March.

Dewachter, H., and H. Lustig, 1997. “A Cross-Country Comparison of CPI as a Measure of Inflation”, Centre for Economic Studies Discussion Paper DPS 97-06, Leuven.

Dow, J., 1994. “Measuring Inflation Using Multiple Price Indexes”, Unpublished Manuscript, Department of Economics, University of California-Riverside, June.

Friedman, M., 1969. The Optimum Quantity of Money and Other Essays, Aldine: Chicago.

Gartner, C., and G. Wehinger, 1998. “Core Inflation in Selected European Union Countries”, Oesterreichische Nationalbank Working Paper No. 33, September.

Hoffmann, J., 1998. “Problems of Inflation Measurement in Germany”, Economic Research Group of the Deutsche Bundesbank Discussion Paper 1/98.

Kearns, J., 1998. “The Distribution and Measurement of Inflation”, Reserve Bank of Australia Research Discussion Paper 9810.

Laflèche, T., 1997. “Statistical Measures of the Trend Rate of Inflation”, Bank of Canada Review, Autumn, pp. 29-47.

Meyler, A., G. Kenny, and T. Quinn, 1998. “Forecasting Irish Inflation Using ARIMA Models”, Central Bank of Ireland Technical Paper 3/RT/98.

Mio, H., and M. Higo, 1999. “Underlying Inflation and the Distribution of Price Changes: Evidence from the Japanese Trimmed Mean CPI”, Bank of Japan IMES Discussion Paper Series No. 99-E-5.

Quah, D., and S. Vahey. 1995. “Measuring Core Inflation”, Economic Journal, Vol. 105, September, pp. 1130-1144.

Roger, S., 1998. “Core Inflation: Concepts, Uses and Measurement”, Reserve Bank of New Zealand Discussion Paper Series G98/9.

Roger, S., 1997. “A Robust Measure of Core Inflation in New Zealand, 1949-96”, Reserve Bank of New Zealand Discussion Paper Series G97/7.

Wynne, M., 1997. “Commentary (on Measuring Short-Run Inflation for Central Bankers)”, Federal Reserve Bank of St. Louis Review, May/June, pp. 161-167.