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malisah thank you for the answer :) i am doing the perron test and all variables are non-stationary and after i am doing the augmented dickey fuller test and variables are stationary.doing the johansen cointegration method i have to use my stationary variables or my non stationary variables?? thank ...

please help me because is for my economic dissertation and i have to explain it

thank you

please can anyone help me??

what stationarity means?? why do we use it and why is it usefulness??

thank you