This thesis consists of four papers concerning modelling of count data and tourism demand. For three of the papers the focus is on the integer-valued autoregressive moving average model class (INARMA), and especially on the INAR(1) model. The fourth paper studies the interaction between...

This paper investigates the quality of preliminary figures in the Norwegian national accounts. To address the problem of few observations in such analyses, we use some recently developed system tests. Preliminary figures for gross fixed capital formation (investments) under-predict the final...

Recent research has focused on the links between long memory and structural change, stressing the long memory properties that may arise in models with parameter changes. In this paper, we contribute to this research by comparing the forecasting abilities of long memory and Markov switching...