我现在也在做time series的cointegration test.个人人为用johansen ML比GC来得好,因为ML比GC更容易得出cointegration relationship,而且不用考虑varibales是exogenous or endogenous
一般都是在stationary series上才做cointegration test的,所以firstly, test the stationarity, if the series is sationary then test the cointegration, otherwise, difference the series first.