Karlsen, Hans Arnfinn; Tjostheim, Dag - 1998
consideration in independent and identical parts. A tail condition on the distribution of the recurrence time is introduced. This … convergence rate is slower than in the stationary case, and it is directly linked to the tail behaviour of the recurrence time …. -- null recurrent Markov chain ; nonparametric kernel estimators ; Nonstationary time series models ; split chain …