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Peter Phillips and Zhentao Shi

International Economic Review, 2021, vol. 62, issue 2, 521-570

Abstract: We propose a procedure of iterating the HP filter to produce a smarter smoothing device, called the boosted HP (bHP) filter, based on L2‐boosting in machine learning. Limit theory shows that the bHP filter asymptotically recovers trend mechanisms that involve integrated processes, deterministic drifts, and structural breaks, covering the most common trends that appear in current modeling methodology. A stopping criterion automates the algorithm, giving a data‐determined method for data‐rich environments. The methodology is illustrated in simulations and with three real data examples that highlight the differences between simple HP filtering, the bHP filter, and an alternative autoregressive approach.

Date: 2021
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Working Paper: Boosting: Why You Can Use the HP Filter (2020) Downloads
Working Paper: Boosting: Why you Can Use the HP Filter (2019) Downloads
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