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The Band Pass Filter

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  • Lawrence J. Christiano
  • Terry J. Fitzgerald

Abstract

The `ideal' band pass filter can be used to isolate the component of a time series that lies within a particular band of frequencies. However, applying this filter requires a dataset of infinite length. In practice, some sort of approximation is needed. Using projections, we derive approximations that are optimal when the time series representations underlying the raw data have a unit root, or are stationary about a trend. We identify one approximation which, though it is only optimal for one particular time series representation, nevertheless works well for standard macroeconomic time series. To illustrate the use of this approximation, we use it to characterize the change in the nature of the Phillips curve and the money-inflation relation before and after the 1960s. We find that there is surprisingly little change in the Phillips curve and substantial change in money growth-inflation relation.

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Bibliographic Info

Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 7257.

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Date of creation: Jul 1999
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Handle: RePEc:nbr:nberwo:7257

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  1. The long and short of the AIG bailout
    by Scott Condie in econosseur on 2009-01-08 23:19:13
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