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Previous issue date: 2000-04-04T00:00:00Z / Faz revisão teórica dos modelos de value-at-risk (VAR). Revisa principais estudos anteriores sobre VAR no Brasil e no exterior. Testa o desempenho de cinco metodologias de VAR, a saber: metodologia Paramétrica com uso da Volatilidade Histórica, Paramétrica com uso da Volatilidade EWMA, Paramétrica com uso da Volatilidade GARCH(1,1), Simulação Histórica e uma Metodologia Híbrida proposta por BOUDOUKH e taI (1998). Aplica as metodologias a carteiras teóricas compostas por proporções diversas de ações e títulos de renda fixa de 30 dias no mercado financeiro brasileiro. O trabalho encontra evidências da superioridade da Metodologia Híbrida com fator de caimento de 0,99 e da Simulação Histórica, sendo esta apenas marginalmente inferior, Estes resultados se coadunam com evidências encontradas nas séries em estudo de não normalidade, heterocedasticidade e autocorrelação. / This work analyses the performance of five value-at-risk methodologies, namely the Parametric Methodology making use of Historic Volatility, Parametric Methodology making use of Exponencial Weighting Moving Average (EWMA), Parametric Methodology making use of GARCH( 1,1), Historic Simulation and a Hybrid Methodology proposed by BOUDOUKH et aI. (1998). These models were applyied to the return time series of Ibovespa and 30-day fixed rate bonds, setting up five theoretic portfolios with varying weights of these two assets. Evidences in the studied period showed a superior performance of the Hybrid Methodology using a decay facto r of 0,99, followed closely by Historic Simulation. These results agree with the main time series characteristics, that is, non-normality, autocorrelation and heteroskedasticity of returns. Considering the remaining Parametric Methodologies, the EWMA volatility with decay factor of 0,99 achieved better results than GARCH (1, 1) and historic volatility. The worst results were provided by historic volatility. The initial hypothesis of this work, refering to a possible relationship between the performance of different VAR methodologies and the volatility level of the portfolio, that is, high/low volatility assets could have a major/minor response to methodology change, was not sustained by empirical evidences.
| Identifer | oai:union.ndltd.org:IBICT/oai:bibliotecadigital.fgv.br:10438/4735 |
| Date | 04 April 2000 |
| Creators | Lombardo, Marcia |
| Contributors | Puggina, Wladimir A., Santos, José Evaristo dos, Escolas::EAESP, Eid Júnior, William |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional do FGV, instname:Fundação Getulio Vargas, instacron:FGV |
| Rights | info:eu-repo/semantics/openAccess |
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