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Schlicht, Ekkehart (2007): Trend Extraction From Time Series With Missing Observations. Discussion Papers in Economics 2007-18
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Abstract

Trend extraction from time series is often performed by using the filter proposed by Leser (1961), also known as the Hodrick-Prescott filter. A practical problem arises, however, when some data points are missing. This note proposes a method for coping with this problem.