Abstract
We consider the problem of finding the maximal asymptotic bias of an M-estimator of a location parameter, using a preliminary estimate of the unknown scale parameter, when the error distribution is assumed to lie in an ϵ-contamination neighborhood of a fixed symmetric unimodal distribution. The least favorable contaminating distribution is shown to put all its mass at ∞ under some fairly general conditions. A particular case considered is that of the auxiliary scale estimator being a location-invariant and scale-equivariant version of a trimmed variance.
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