A HYBRID BOOTSTRAP APPROACH TO UNIT ROOT TESTS

Guodong Li, Chenlei Leng and Chih-Ling Tsai

Journal of Time Series Analysis, 2014, vol. 35, issue 4, 299-321

Abstract: type="main" xml:id="jtsa12019-abs-0001"> This article proposes a hybrid bootstrap approach to approximate the augmented Dickey–Fuller test by perturbing both the residual sequence and the minimand of the objective function. Since innovations can be dependent, this allows the inclusion of conditional heteroscedasticity models. The new bootstrap method is also applied to least absolute deviation-based unit root test statistics, which are efficient in handling heavy-tailed time-series data. The asymptotic distributions of resulting bootstrap tests are presented, and Monte Carlo studies demonstrate the usefulness of the proposed tests.

Date: 2014
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