There is a general discussion that dependent variables used in the ARDL method should be stationary at level I [1]. However, in some studies, the ARDL method was used, although the dependent variable was stationary at the I [0] level. Can it be said that these analyses are not accurate? In addition, since NARDL methods are ARDLbased estimators, do dependent variables have to be stationary at level I [1]?
ARDL/ NARDL QARDL and some other versions of ARDL usually have the preconditions of cointegarion which can be achieved when the dependent variable is I(1) and at least one of the independent variables too is I(1). You can read the original papers the established these techniques, you will observe the model used for testing the method is a contigerated one .
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