Consequences of Hodrick-Prescott filtering for parameter estimation in a structural model of inventory behaviour

D. Doorn

Applied Economics, 2006, vol. 38, issue 16, 1863-1875

Abstract: Much work in macroeconomics relies on detrending a time series prior to analysis. A popular method of detrending has been the Hodrick-Prescott (HP) filter. This filter has been widely applied in the Real Business Cycle literature to isolate the behaviour of economic variables at business cycle frequencies and to look at comovements between series over the business cycle. Prior work has shown that the use of this filter can have serious consequences for such analysis, such as inducing spurious correlations, and that a researcher should proceed with caution when applying the filter. Another use of HP filtering has been to achieve stationarity prior to estimation of structural econometric models. Little work has been done concerning the possible effects this method of detrending may have on parameter estimation from such models. Given the problems with the filter noted in the literature, it is likely these effects may be of some consequence to estimation results. Using a common model of inventory behaviour, a simulation study is conducted to assess the impact of using the HP filter for detrending prior to estimation. A comparison will be made to other methods of handling trend to gauge relative performance.

Date: 2006
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DOI: 10.1080/00036840500427254

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