Variable

AIC

SC

AR root test

Y, X1, X2, X3, X4

64.3085

67,0291

Non-stationary

Y, X1, X2, X3

55.3649

57.1456

Non-stationary

Y, X1, X2, X4

56.6928

58.4736

Stationary

Y, X2, X3, X4

47.1315^a

48.9123

Non-stationary