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  "Title": "The One- And Two-Sided Hodrick-Prescott Filter",
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  "Description": "Provides two functions that implement the one-sided and\ntwo-sided versions of the Hodrick-Prescott filter. The\none-sided version is a Kalman filter-based implementation,\nwhereas the two- sided version uses sparse matrices for\nimproved efficiency. References: Hodrick, R. J., and Prescott,\nE. C. (1997) <doi:10.2307/2953682> Mcelroy, T. (2008)\n<doi:10.1111/j.1368-423X.2008.00230.x> Meyer-Gohde, A. (2010)\n<https://ideas.repec.org/c/dge/qmrbcd/181.html> For more\nreferences, see the vignette.",
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      "title": "hpfilter: An R Implementation of the One- and Two-Sided Hodrick-Prescott Filter",
      "author": "Alexandru Monahov",
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        "The Hodrick-Prescott Filter",
        "Short mathematical overview",
        "References",
        "Functions",
        "hp1 - the one-sided HP Filter",
        "hp2 - the Two-Sided HP Filter",
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        "Studying the GDP cycle with a two-sided HP filter",
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