Real-Time State-Space Method for Computing Smoothed Estimates for Future Revisions of U.S. Monthly Chained CPI

P. Zadrozny

Published 2016 in Social Science Research Network

ABSTRACT

Well known CPI of urban consumers is never revised. Recently initiated chained CPI is initially released every month (ICPI), for that month without delay within BLS and for the previous month with one month delay to the public. Final estimates of chained CPI (FCPI) are released every February for January to December of the calendar year two years before. Every month, simultaneously with the release of ICPI, we would like to have a best estimate, given current information, of FCPI for that month, which will not be released until two calendar years later. ICPI and FCPI data may be indexed in historical time by months of occurrence or in current or real time by months of observation or release. The essence of the solution method is to use data indexed in historical time to estimate models and, then, for an estimated model, to use data indexed in real time to estimate FCPI. We illustrate the method with regression and VARMA models. Using a regression model, estimated FCPI is given directly by an estimated regression line; and, using a VARMA model, estimated FCPI is computed using a Kalman smoother.* *The paper has been presented at the following conferences: Computing in Economics and Finance (Montreal, June 2007), Measurement Errors (Birmingham, UK, July 2007), Joint Statistical Meeting (Salt Lake City, August 2007), NBER-NSF Time-Series (Iowa City, Sept. 2007), CIRANO Data Revision in Macroeconomic Forecasting and Policy (Montreal, Oct. 2007), Society for Nonlinear Dynamics and Econometrics (Atlanta, April 2009), UCR Business Cycles (Riverside, April 2009), Econometric Society (Boston, June 2009), and Midwest Macro (Nashville, May 2011). The paper represents the author's views and does not necessarily represent any official positions of the Bureau of Labor Statistics. **Affiliated as Research Fellow with Center for Financial Studies (CFS), Johann Wolfgang Goethe University, Frankfurt, Germany, and with Center for Economic Studies and Ifo Institute for Economic Research (CESifo), Munich, Germany.

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    2016

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    Social Science Research Network

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    Semantic Scholar

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