'Taking the difference of stationary time series

I working on the relationship between financial development, Economic growth and Domestic credit using a VAR technique.

Meanwhile, one of my variables is non-stationary(Domestic credit), instead of differencing the non-stationary time series, I took the first difference of all the variables which is found to be stationary.

Therefore, I write to inquire, if there are any implications on this (that's taking the difference of stationary time series with a non-stationary time series and analysing with a VAR model).

Look forward to hearing your responses.

Best regards,



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