Comment on "The uncertain unit root in real GNP: A re-examination"

Mishra, T. (2009). Comment on "The uncertain unit root in real GNP: A re-examination". Journal of Macroeconomics 31 (1) 167-172. 10.1016/j.jmacro.2007.10.004.

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With the objective to settle the often conflicting and inconclusive extant debate on whether the observed secular growth can be characterized by a deterministic or stochastic trend, Darne comes up with an alternative method - the outlier detection methodology and studies the persistence properties of US real GNP for the period 1869-1993. Given that the presence of outliers in a time series - unless detected and adjusted - often render wrong impression on the persistence properties and their implications for long-run growth, Darni's contribution in this regard is significant. Outliers of varied types assume varying persistence profiles, therefore detection of them in the GNP growth is a pre-requisite for characterizing the series in a stochastic or deterministic setting. To further intuition on the exact nature of persistence, I applied fractional integration test of the four real GNP series and found that outlier adjusted GNP series are mean-reverting and are more persistent than original. The rate of convergence of stochastic shocks to long-run mean have important implications for growth dynamics.

Item Type: Article
Uncontrolled Keywords: Long-memory; Outlier methodology; Stochastic trend in GNP; Unit root
Research Programs: World Population (POP)
Postdoctoral Scholars (PDS)
Bibliographic Reference: Journal of Macroeconomics; 31(1):167-172 (March 2009) (Published online 26 October 2007)
Depositing User: IIASA Import
Date Deposited: 15 Jan 2016 08:42
Last Modified: 27 Aug 2021 17:38

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