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You searched for "unobserved components"

Econometrics Paper
Testing for a Slowly Changing Level with Special Reference to Stochastic Volatility - (Now published in 'Journal of Econometrics', 87 (1998), pp.167-189.) Andrew C Harvey and Mariane Streibel March 1996
Paper No' EM/1996/306:
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Tags: exchange rates; garch model; locally best invariant test; serial correlation; stochastic volatility; unobserved components; von mises distribution.

Econometrics Paper
Exact Score for Time Series Models in State Space Form (Now published in Biometrika (1992), 79, 4, pp.283-6.) Siem Jan Koopman and N.G. Shephard  1992
Paper No' EM/1992/241:
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Tags: smoothing; kahman filter; em algorithm; unobserved components model; profile likelihood.