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One-dimensional inference in autoregressive models with the potential presence of a unit root

Author(s)
Mikusheva, Anna
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Abstract
This paper examines the problem of testing and confidence set construction for one-dimensional functions of the coefficients in autoregressive (AR(p)) models with potentially persistent time series. The primary example concerns inference on impulse responses. A new asymptotic framework is suggested and some new theoretical properties of known procedures are demonstrated. I show that the likelihood ratio (LR) and LR± statistics for a linear hypothesis in an AR(p) can be uniformly approximated by a weighted average of local-to-unity and normal distributions. The corresponding weights depend on the weight placed on the largest root in the null hypothesis. The suggested approximation is uniform over the set of all linear hypotheses. The same family of distributions approximates the LR and LR± statistics for tests about impulse responses, and the approximation is uniform over the horizon of the impulse response. I establish the size properties of tests about impulse responses proposed by Inoue and Kilian (2002) and Gospodinov (2004), and theoretically explain some of the empirical findings of Pesavento and Rossi (2007). An adaptation of the grid bootstrap for impulse response functions is suggested and its properties are examined.
Date issued
2012-01
URI
http://hdl.handle.net/1721.1/72467
Department
Massachusetts Institute of Technology. Department of Economics
Journal
Econometrica
Publisher
The Econometric Society
Citation
Mikusheva, Anna. “One-Dimensional Inference in Autoregressive Models With the Potential Presence of a Unit Root.” Econometrica 80.1 (2012): 173-212.
Version: Author's final manuscript
ISSN
0012-9682
1468-0262

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