The sensitivity of the Mbw-estimator to skewness and heteroskedasticity
extends to other robust estimators. This is obvious
for estimators that explicitly depend on symmetry, such as
the Gastwirth and trimean estimators introduced by Koenker and
Bassett (1978). However, more modern robust estimators, such as
those used by Temple (1998) and Zaman et al. (2001), are also
sensitive to departures from the assumption of symmetric homoskedastic
errors. Simulation results for these and other estimators
are presented in Baldauf and Santos Silva (2009).