The dependent variable I chose for the study is stationary at level I(0), and other variables are a mixture of I(0) and I(1) time series data.
Can I use the ARDL model for this study? Which model is appropriate?
In the study of G. De Vita et.al. it says "….. it is necessary to ensure that the dependent variable is I(1) in levels .......". https://doi.org/10.1016/j.enpol.2005.07.016