ADF Test Procedure

[monny]

Hi Guys, I need a little help please.

I conducted the ADF unit root test, and in sequence also (intercept + trend, intercept, none).

If intercept and trend is rejected, then the conclusion is trend stationary process. The stationary series is obtained by detrending the series.

If intercept is rejected, then the conclusion is level stationary process. How do I treat the series for it to become stationary?

If none is rejected, then the conclusion is zero mean process. How do I also treat this one?

I'm aware that the test should be conducted sequentially, and the arrives at a conclusion when a rejection is met.

For first difference rejection in ADF test, getting the first difference of the series is the stationary series.


Do I have correct information above? I'm just new to this field. Thank you Masters!