is it good to use VECM when there is 1 nonstationary variable at level butstationer at first difference, then others have stationarity at level and first diff? i use I(1) for the model so that every variable are integrated on order I(1).
No, it not good.
Check this link.
https://stats.stackexchange.com/questions/148994/var-or-vecm-for-a-mix-of-stationary-and-nonstationary-variables
at least two I(1) variables
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