PANEL UNIT ROOT

What are the null and alternative hypothesis of panel unit root testing?
Sayed Hossain commented as such>

1. Levin, Lin and Chu
Null: Panel data has unit root (assume common unit root process)
Alternative: Panel data does not have unit root.
2. Breitung (2000)
Null: Panel data has unit root (assume common unit root process)
Alternative: Panel data does not have unit root.
3. Im, Pesaran and Shin (2003)
Null: Panel data has unit root (assume individual unit root process)
Alternative: Panel data does not have unit root.
4. Fisher type testing using ADF and PP test (Maddala and Wu(1999)
and Choi (2001)
Null: Panel data has unit root (assume individual unit root process)
Alternative: Panel data does not have unit root.
5. Hadri (1999)
Null: Panel data having no unit root (assume common unit root process)
Alternative: Panel data does have unit root.
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