Tuesday, February 12, 2019

global economic activity

LUTZ KILIAN, University of Michigan at Ann Arbor - Department of Economics, Centre for Economic Policy Research (CEPR)
Email: lkilian@umich.edu
Hamilton (2018) suggests that the Kilian (2009) index of global real economic activity is misleading and calls for alternative measures. The problem documented by Hamilton is a consequence of a coding mistake. Specifically, the index of nominal freight rates underlying the Kilian index was accidentally logged twice. Once this coding error is corrected by removing one of the log transformations, none of the concerns raised by Hamilton remains valid and the index may be used as originally intended. Moreover, it can be shown that the corrected index differs only slightly from the original index and that the key empirical results in Kilian (2009) and related studies remain unchanged when replacing the index.


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