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- W3125563229 abstract "While coping with nonsphericality of the disturbances, standard GMM suffers from a blind spot for exploiting the most effective instruments when these are obtained directly from unconditional rather than conditional moment assumptions. For instance, standard GMM counteracts that exogenous regressors are used as their own optimal instruments. This is easily seen after transmuting GMM for linear models into IV in terms of transformed variables. It is demonstrated that modified GMM (MGMM), exploiting straight-forward modifications of the instruments, can achieve substantial efficiency gains and bias reductions, even under mild heteroskedasticity. Feasible MGMM implementations and their standard error estimates are examined and compared with standard GMM and IV for a range of typical models for cross-section data, both by simulation and by empirical illustration." @default.
- W3125563229 created "2021-02-01" @default.
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- W3125563229 date "2014-11-01" @default.
- W3125563229 modified "2023-09-28" @default.
- W3125563229 title "Efficiency Gains by Modifying GMM Estimation in Linear Models under Heteroskedasticity" @default.
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