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) |
|---|---|
| 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