Modelagem e previsão de volatilidade determinística e estocástica para a série do Ibovespa
DOI:
https://doi.org/10.1590/1980-53572931imAbstract
The variance of an asset is the most important information for an investor that deals in
the financial markets. The measurement of that volatility can be done in two different
ways. The first one, deterministic case, is done by taking as a starting point the
knowledge of conditional variance. In the other approach, called stochastic volatility,
one does not know a priori the volatility of the asset. These models are used in many
different formulations to explain the specific characteristics observed in the financial
time series, such as volatility clustering, leverage effect and persistence of the volatility.
In this paper, the volatility of the Sdo Paulo Stock Exchange Index (Ibovespa) is modelled
by the two processes described above. The period analysed goes from july/94 until
october/98, include three critical periods of the world financial markets: the Mexican
crisis, the Asian crisis and finally the Russian debacle. The main conclusion is that both process perform quite well.
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Copyright (c) 1999 Igor A. C. de Morais, Marcelo S. Portugal
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