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A Hodrick-Prescott filter with automatically selected jumps

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  • Maranzano, Paolo
  • Pelagatti, Matteo

Abstract

The Hodrick-Prescott filter is a popular tool in macroeconomics for decomposing a time series into a smooth trend and a business cycle component. The last few years have witnessed global events, such as the Global Financial Crisis, the COVID-19 pandemic, and the war in Ukraine, that have had abrupt structural impacts on many economic time series. Moreover, new regulations and policy changes generally lead to similar behaviours. Thus, those events should be absorbed by the trend component of the trend-cycle decomposition, but the Hodrick-Prescott filter does not allow for jumps. We propose a modification of the Hodrick-Prescott filter that contemplates jumps and automatically selects the time points in which the jumps occur. We provide an efficient implementation of the new filter in an R package. We use our modified filter to assess what Italian labour market reforms impacted employment in different age groups.

Suggested Citation

  • Maranzano, Paolo & Pelagatti, Matteo, 2024. "A Hodrick-Prescott filter with automatically selected jumps," FEEM Working Papers 344134, Fondazione Eni Enrico Mattei (FEEM).
    • Handle: RePEc:ags:feemwp:344134
    DOI: 10.22004/ag.econ.344134
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    References listed on IDEAS

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