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This paper investigates the effect of serial dependence in the data on the efficiency of some robust estimators. When the observations are from a stationary process satisfying certain mixing conditions, linear combinations of order statistics and the Hodges-Lehmann estimator are shown to be asymptotically normally distributed. Gaussian processes are studied in detail and it is shown that when all the serial correlations (ₙ) are 0, the efficiency of the robust estimators relative to the mean is greater than in the case of independent observations.
Gastwirth et al. (Mon,) studied this question.