Please use this identifier to cite or link to this item: http://hdl.handle.net/10419/91321
Authors: 
Fonseca, Thaís C. O.
Cerqueira, Vinícius S.
Migon, Hélio S.
Torres, Cristian A. C.
Year of Publication: 
2013
Series/Report no.: 
Texto para Discussão, Instituto de Pesquisa Econômica Aplicada (IPEA) 1872
Abstract (Translated): 
In this work we consider modeling the past volatilities through a Generalized Autoregressive Conditional Heteroskedasticity (GARCH) model using the Bayesian approach. Asymmetries in the shocks are accommodated by smooth transition models for the variance. We discuss problems related to the likelihood function and propose a solution. In order to account for heavy tails in the applications we consider Student-t errors. The Jeffrey's prior is used in this context to correct problems in the estimation of degrees of freedom. A simulated study is presented to highlight the advantages of the proposed methodology and an application to the Brazilian index of prices illustrates the usefulness of the asymmetric GARCH model with student-t errors.
Subjects: 
Student-t
GARCH model
Bayesian approach
Jeffrey's prior
JEL: 
C22
C12
C13
Document Type: 
Working Paper

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