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On the Choice of the Unit Period in Time Series Models

  • Peter Fuleky

    ()

    (UHERO, and Department of Economics, University of Hawaii at Manoa)

When estimating the parameters of a process, researchers can choose the reference unit of time (unit period) for their study. Frequently, they set the unit period equal to the observation interval. However, I show that decoupling the unit period from the observation interval facilitates the comparison of parameter estimates across studies with different data sampling frequencies. If the unit period is standardized (for example annualized) across these studies, then the parameters will represent the same attributes of the underlying process, and their interpretation will be independent of the sampling frequency.

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File URL: http://www.uhero.hawaii.edu/assets/WP_2011-4.pdf
File Function: First version, 2011
Download Restriction: no

Paper provided by University of Hawaii Economic Research Organization, University of Hawaii at Manoa in its series Working Papers with number 2011-4.

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Length: 9 pages
Date of creation: Aug 2011
Date of revision:
Handle: RePEc:hae:wpaper:2011-4
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  1. Veronika Czellar & G. Andrew Karolyi & Elvezio Ronchetti, 2005. "Indirect Robust Estimation of the Short-term Interest Rate Process;," Research Papers by the Institute of Economics and Econometrics, Geneva School of Economics and Management, University of Geneva 2005.02, Institut d'Economie et Econométrie, Université de Genève.
  2. Andrew W. Lo, . "Maximum Likelihood Estimation of Generalized Ito Processes with Discretely Sampled Data," Rodney L. White Center for Financial Research Working Papers 15-86, Wharton School Rodney L. White Center for Financial Research.
  3. Ball, Clifford A. & Torous, Walter N., 1996. "Unit roots and the estimation of interest rate dynamics," Journal of Empirical Finance, Elsevier, vol. 3(2), pages 215-238, June.
  4. Chan, K C, et al, 1992. " An Empirical Comparison of Alternative Models of the Short-Term Interest Rate," Journal of Finance, American Finance Association, vol. 47(3), pages 1209-27, July.
  5. Veronika Czellar & G. Andrew Karolyi & Elvezio Ronchetti, 2007. "Indirect robust estimation of the short-term interest rate process," Post-Print hal-00463251, HAL.
  6. Bergstrom, A. R., 1988. "The History of Continuous-Time Econometric Models," Econometric Theory, Cambridge University Press, vol. 4(03), pages 365-383, December.
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