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Semiparametric Time Series Models with Log-concave Innovations: Maximum Likelihood Estimation and its Consistency

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  • Yining Chen

Abstract

type="main" xml:id="sjos12092-abs-0001"> We study semiparametric time series models with innovations following a log-concave distribution. We propose a general maximum likelihood framework that allows us to estimate simultaneously the parameters of the model and the density of the innovations. This framework can be easily adapted to many well-known models, including autoregressive moving average (ARMA), generalized autoregressive conditionally heteroscedastic (GARCH), and ARMA-GARCH models. Furthermore, we show that the estimator under our new framework is consistent in both ARMA and ARMA-GARCH settings. We demonstrate its finite sample performance via a thorough simulation study and apply it to model the daily log-return of the FTSE 100 index.

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  • Yining Chen, 2015. "Semiparametric Time Series Models with Log-concave Innovations: Maximum Likelihood Estimation and its Consistency," Scandinavian Journal of Statistics, Danish Society for Theoretical Statistics;Finnish Statistical Society;Norwegian Statistical Association;Swedish Statistical Association, vol. 42(1), pages 1-31, March.
    • Handle: RePEc:bla:scjsta:v:42:y:2015:i:1:p:1-31
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    File URL: http://hdl.handle.net/10.1111/sjos.12092
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