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http://hdl.handle.net/10071/11256
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Title: A comparative analysis of the predictive power of implied volatility indices and GARCH forecasted volatility
Authors: Bentes, S. R.
Keywords: Implied volatility
GARCH forecasted volatility
Inefficiency
Out-of-sample forecasting accuracy
Issue Date: 2015
Publisher: Elsevier
Abstract: This paper examines the accuracy of implied volatility and GARCH forecasted volatility to predict the behavior of realized volatility. The methodology adopted addresses the information content, the bias, the efficiency and the efficiency forecast of the predictor. In previous studies on this topic, efficiency has been analyzed both in terms of the efficiency of the predictor itself and its forecasting efficiency. In this context, implied volatility is the predictor and the efficiency is assessed through the validation of some of the OLS (Ordinary Least Squares) assumptions. However, those studies paid little attention to the heteroskedasticity of the residuals, even though this is an important source of inefficiency. Our study accounts for conditional heteroskedasticity by using a GARCH model to predict the time-dependent variance of the residuals. A GARCH forecasted volatility index was constructed based on these estimates. In addition, we employ out-of-sample forecasting accuracy tests in order to identify the best forecasting model. The results clearly show that GARCH forecasted volatility outperforms implied volatility to produce out-of-sample forecasts based on a subsample of the total sampling period for the four stock markets analyzed.
Peer reviewed: yes
URI: http://hdl.handle.net/10071/11256
DOI: 10.1016/j.physa.2015.01.020
ISSN: 0378-4371
Ciência-IUL: https://ciencia.iscte-iul.pt/id/ci-pub-28820
Accession number: WOS:000350192200013
Appears in Collections:BRU-RI - Artigos em revistas científicas internacionais com arbitragem científica

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