Document Type
Discussion Paper
Publication Date
9-1-1997
CFDP Number
1161
CFDP Pages
18
Abstract
This paper proposes an ADF coefficient test for detecting the presence of a unit root in ARMA models of unknown order. Our approach is fully parametric. When the time series has an unknown deterministic trend, we propose a modified version of the ADF coefficient test based on quasi-differencing in the construction of the detrending regression as in Elliot, Rothenberg and Stock (1996). The limit distributions of these test statistics are derived. Empirical applications of these tests for common macroeconomic time series in the US economy are reported and compared with the usual ADF t -test.
Recommended Citation
Xiao, Zhijie and Phillips, Peter C.B., "An ADF Coefficient Test for A Unit Root in ARMA Models of Unknown Order with Empirical Applications to the U.S. Economy" (1997). Cowles Foundation Discussion Papers. 1409.
https://elischolar.library.yale.edu/cowles-discussion-paper-series/1409