RT Book, Section T1 Multivariate Stochastic Variance Models A1 Harvey, Andrew A1 Ruiz Ortega, Esther A1 Shephard, Neil AB Changes in variance, or volatility, over time can be modeled using the approach based on autoregressive conditional heteroscedasticity. Another approach is to model variance as an unobserved stochastic process. Although it is not easy to obtain the exact likelihood function for such stochastic variance models, they tie in closely with developments in finance theory and have certain statistical attractions. This article sets up a multivariate model, discusses its statistical treatment, and shows how it can be modified to capture common movements in volatility in a very natural way. The model is then fitted to daily observations on exchange rates. PB Oxford University Press SN 9780198774327 SN 019877432X YR 1995 FD 1995 LK https://hdl.handle.net/10016/4783 UL https://hdl.handle.net/10016/4783 LA eng NO Publicado además en: The Review of Economic Studies, 1994, vol. 61, n. 2, p. 247-264 NO Publicado además en: Recent developments in Time Series, 2003, vol. 2, pp. 134-152 NO Publicado además en: Selected Readings for Stochastic Volatility, 2005, p. 156-176, ISBN10: 0199257191, ISBN13: 9780199257195 DS e-Archivo RD 1 jun. 2024