Modelling Conditional and Unconditional Heteroskedasticity with Smoothly Time-Varying Structure

Cristina Amado () and Timo Teräsvirta

No 03/2008, NIPE Working Papers from NIPE - Universidade do Minho

Abstract: In this paper, we propose two parametric alternatives to the standard GARCH model. They allow the conditional variance to have a smooth time-varying structure of either additive or multiplicative type. The suggested parameterizations describe both nonlinearity and structural change in the conditional and unconditional variances where the transition between regimes over time is smooth. A modelling strategy for these new time-varying parameter GARCH models is developed. It relies on a sequence of Lagrange multiplier tests, and the adequacy of the estimated models is investigated by Lagrange multiplier type misspecification tests. Finite-sample properties of these procedures and tests are examined by simulation. An empirical application to daily stock returns and another one to daily exchange rate returns illustrate the functioning and properties of our modelling strategy in practice. The results show that the long memory type behaviour of the sample autocorrelation functions of the absolute returns can also be explained by deterministic changes in the unconditional variance.

Keywords: Conditional heteroskedasticity; Structural change; Lagrange multiplier test; Misspecification test; Nonlinear time series; Time-varying parameter model. (search for similar items in EconPapers)
JEL-codes: C12 C22 C51 C52 (search for similar items in EconPapers)
Date: 2008
New Economics Papers: this item is included in nep-ets
References: Add references at CitEc
Citations: View citations in EconPapers (44)

Downloads: (external link)
http://www3.eeg.uminho.pt/economia/nipe/docs/2008/NIPE_WP_3_2008.PDF (application/pdf)

Related works:
Working Paper: Modelling Conditional and Unconditional Heteroskedasticity with Smoothly Time-Varying Structure (2008)
Working Paper: Modelling Conditional and Unconditional Heteroskedasticity with Smoothly Time-Varying Structure (2008)
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nip:nipewp:03/2008

Ordering information: This working paper can be ordered from

Access Statistics for this paper

More papers in NIPE Working Papers from NIPE - Universidade do Minho Núcleo de Investigação em Políticas Económicas e Empresariais, Escola de Economia e Gestão, Universidade do Minho, P-4710-057 Braga, Portugal. Contact information at EDIRC.
Bibliographic data for series maintained by NIPE ().