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Sökning: WFRF:(Genton Marc G.)

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  • Wijayatunga, Priyantha, 1967-, et al. (författare)
  • Discussion on the meeting on 'Data visualization'
  • 2019
  • Ingår i: Journal of the Royal Statistical Society. - UK : Royal Statistical Society. - 0964-1998 .- 1467-985X. ; 182:2, s. 433-441
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Visualizing both conditional and marginal associations in contingency tables by using simple diagrams is discussed
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  • de Luna, Xavier, et al. (författare)
  • Robust Simulation-Based Estimation of ARMA Models
  • 2001
  • Ingår i: Journal of Computational and Graphical Statistics. ; 10, s. 370-387
  • Tidskriftsartikel (refereegranskat)abstract
    • This article proposes a new approach to the robust estimation of a mixed autoregressive and moving average (ARMA) model. It is based on the indirect inference method that originally was proposed for models with an intractable likelihood function. The estimation algorithm proposed is based on an auxiliary autoregressive representation whose parameters are first estimated on the observed time series and then on data simulated from the ARMA model. To simulate data the parameters of the ARMA model have to be set. By varying these we can minimize a distance between the simulation-based and the observation-based auxiliary estimate. The argument of the minimum yields then an estimator for the parameterization of the ARMA model. This simulation-based estimation procedure inherits the properties of the auxiliary model estimator. For instance, robustness is achieved with GM estimators. An essential feature of the introduced estimator, compared to existing robust estimators for ARMA models, is its theoretical tractability that allows us to show consistency and asymptotic normality. Moreover, it is possible to characterize the influence function and the breakdown point of the estimator. In a small sample Monte Carlo study it is found that the new estimator performs fairly well when compared with existing procedures. Furthermore, with two real examples, we also compare the proposed inferential method with two different approaches based on outliers detection.
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  • Resultat 1-5 av 5

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