Arbeitspapier

Seasonality with Trend and Cycle Interactions in Unobserved Components Models

Unobserved components time series models decompose a time series into a trend, a season, a cycle, an irregular disturbance, and possibly other components. These models have been successfully applied to many economic time series. The standard assumption of a linear model, often appropriate after a logarithmic transformation of the data, facilitates estimation, testing, forecasting and interpretation. However, in some settings the linear-additive framework may be too restrictive. In this paper, we formulate a non-linear unobserved components time series model which allows interactions between the trend-cycle component and the seasonal component. The resulting model is cast into a non-linear state space form and estimated by the extended Kalman filter, adapted for models with diffuse initial conditions. We apply our model to UK travel data and US unemployment and production series, and show that it can capture increasing seasonal variation and cycle dependent seasonal fluctuations.

Language
Englisch

Bibliographic citation
Series: Tinbergen Institute Discussion Paper ; No. 08-028/4

Classification
Wirtschaft
Estimation: General
Single Equation Models; Single Variables: Time-Series Models; Dynamic Quantile Regressions; Dynamic Treatment Effect Models; Diffusion Processes
Subject
Seasonal interaction
Unobserved components
Non-linear state space models
Saisonbereinigung
Nichtlineares Verfahren
Zustandsraummodell
Theorie

Event
Geistige Schöpfung
(who)
Koopman, Siem Jan
Lee, Kai Ming
Event
Veröffentlichung
(who)
Tinbergen Institute
(where)
Amsterdam and Rotterdam
(when)
2008

Handle
Last update
10.03.2025, 11:44 AM CET

Data provider

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Object type

  • Arbeitspapier

Associated

  • Koopman, Siem Jan
  • Lee, Kai Ming
  • Tinbergen Institute

Time of origin

  • 2008

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