yanliyu 1.CANOVA,F.and HASEN,B.E.(1995) Are Seasonal patterns constant over time? A test for Seasonal stability. Journal of Buiness and economic Statistics,13(3)L237-252 2.DICKEY,D.A.and HASZA,D.P.and FULLER,W.A.(1984)Testing for unit roots in seasonal time series.Journal of the American Statistical Association,79(386):355 367
hope it helps
- DU1.pdf
- DU2.pdf