Franses, P.H., Boswijk, H. and Haldrup, N. (1997). Multiple unit roots in periodic autoregression Journal of Econometrics, 80:167--193.
5 Key Publications
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Harvey, A., Koopman, S.J. and Riani, M. (1997). The modeling and seasonal adjustment of weekly observations Journal of Business and Economic Statistics, 15(3):354--368.
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Atkinson, A.C., Koopman, S.J. and Shephard, N. (1997). Detecting shocks: Outliers and breaks in time series Journal of Econometrics, 80(2):387--422.
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Koopman, S.J. (1997). Exact initial kalman filtering and smoothing for nonstationary time series models Journal of the American Statistical Association, 92(440):1630--1638.
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Franses, P.H., Hoek, H. and Paap, R. (1997). Bayesian analysis of seasonal unit roots and seasonal mean shifts Journal of Econometrics, 78:359--380.