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Stationarity and Persistence in the GARCH(1,1) Model

Nelson, Daniel B.·1990·Econometric Theory

Abstract

This paper establishes necessary and sufficient conditions for the stationarity and ergodicity of the GARCH(l.l) process. As a special case, it is shown that the IGARCH(1,1) process with no drift converges almost surely to zero, while IGARCH(1,1) with a positive drift is strictly stationary and ergodic. We examine the persistence of shocks to conditional variance in the GARCH(l.l) model, and show that whether these shocks "persist" or not depends crucially on the definition of persistence. We also develop necessary and sufficient conditions for the finiteness of absolute moments of any (including fractional) order.

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Metadata

Authors
Nelson, D. B.
Venue
Econometric Theory
Published
1990-09
Volume
6
Issue
3
Pages
318-334
ISSN
  • 0266-4666 (ISSN-L)
  • 1469-4360
OpenAlex
W2077115352
Cited by
1,093
References
2
FWCI
21.07
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Stationarity and Persistence in the GARCH(1,1) Model. https://app.cochat.ai/papers/10.1017/s0266466600005296
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Nelson, D. B. (1990). Stationarity and Persistence in the GARCH(1,1) Model. Econometric Theory. https://doi.org/10.1017/s0266466600005296

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Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.