Abstract
We examine the effects of exogenous changes in the level or seasonal pattern of a series on the HEGY test. These changes bias both unit root and seasonal root tests. New critical values for the HEGY tests are presented.
Original language | English (US) |
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Pages (from-to) | 13-19 |
Number of pages | 7 |
Journal | Economics Letters |
Volume | 56 |
Issue number | 1 |
DOIs | |
State | Published - Sep 26 1997 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Finance
- Economics and Econometrics