
Estimating the Smoothing Parameter in the
So-Called Hodrick-Prescott Filter
by
Ekkehart Schlicht
Discussion Paper No. 2004-2, Department of Economics,
University of Munich
February 2004

Abstract
This note gives a fairly complete statistical description of the
Hodrick-Prescott Filter (1997) which has been proposed in the context of my
seasonal adjustment method (Schlicht 1981, 1984). A statistics estimator for the
smoothing parameter is proposed that is asymptotically equivalent to the
maximum-likelihood estimator, has a straightforward intuitive interpretation and
works better in small samples than the maximum-likelihood estimator. The method
is illustrated by an application and several simulations.
Hodrick-Prescott filter; Kalman filtering; Kalman-Bucy; Whittaker-Henderson
graduation, spline, state-space models; random walk; time-varying coefficients;
adaptive estimation; time-series; seasonal adjustment; trend
Journal of Economic Literature classification number: C22.
Article
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