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- W2084746178 abstract "We consider nonlinear and heteroscedastic autoregressive models whose residuals are martingale increments with conditional distributions that fulfil certain constraints. We treat two classes of constraints: residuals depending on the past through some function of the past observations only, and residuals that are invariant under some finite group of transformations. We determine the efficient influence function for estimators of the autoregressive parameter in such models, calculate variance bounds, discuss information gains, and suggest how to construct efficient estimators. Without constraints, efficient estimators can be given by weighted least squares estimators. With the constraints considered here, efficient estimators are obtained differently, as one-step improvements of some initial estimator, similarly as in autoregressive models with independent increments." @default.
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- W2084746178 date "2013-06-01" @default.
- W2084746178 modified "2023-10-16" @default.
- W2084746178 title "Variance bounds for estimators in autoregressive models with constraints" @default.
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- W2084746178 doi "https://doi.org/10.1080/02331888.2011.616932" @default.
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