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We explore a periodic analysis in the context of unobserved components time series models that decompose time series into components of interest such as trend and seasonal. Periodic time series models allow dynamic characteristics to depend on the period of the year, month, week or day. In the...
Persistent link: https://www.econbiz.de/10011342560
Structural time series models are formulated in terms of components, such as trends, seasonals and cycles, that have a direct interpretation. As well as providing a framework for time series decomposition by signal extraction, they can be used for forecasting and for ‘nowcasting’. The...
Persistent link: https://www.econbiz.de/10014023699
integrated models and deterministic seasonality models. As well as examining how forecasts are computed in each case, the …. Section 3 discusses less traditional models, specifically nonlinear seasonal models and models for seasonality in variance …. Such nonlinear models primarily concentrate on interactions between seasonality and the business cycle, either using a …
Persistent link: https://www.econbiz.de/10014023693
values) are taken, evidence of seasonality is obtained; more specifically, deterministic seasonality is rejected in favour of …
Persistent link: https://www.econbiz.de/10014427486
demand for Tunisia, by presenting different techniques of detection of seasonality and the parametric and non …
Persistent link: https://www.econbiz.de/10009762132
) nonlinearityand seasonality simultaneously. The model is termed multiplicativeseasonal SETAR (SEASETAR). It can be viewed as a special … multiplicative constraints in non-multiplicative SETARmodels.These statistics form the basis of a new seasonality-test. We …
Persistent link: https://www.econbiz.de/10011304390
Infra-monthly time series have increasingly appeared on the radar of official statistics in recent years, mostly as a consequence of a general digital transformation process and the outbreak of the COVID-19 pandemic in 2020. Many of those series are seasonal and thus in need for seasonal...
Persistent link: https://www.econbiz.de/10013336397
Persistent link: https://www.econbiz.de/10001751667
This paper studies the behaviour of the HEGY tests for quarterly data, for seasonal autoregressive unit roots, when the time series being analysed is deterministic seasonal stationary but exhibits a change in the seasonal pattern. As a by-product, we also analyse the HEGY tests for the...
Persistent link: https://www.econbiz.de/10014175046
Resorting to Monte Carlo simulations, the power properties of three simple tests for the seasonal differencing filter are compared when the data contain seasonal mean shifts. Overall, the results favour the HEGY-GLN test as the most robust
Persistent link: https://www.econbiz.de/10014159070