Generalized Methods of Moments (GMM) estimators are a popular tool in econometrics since introduced by Hansen (1982), because this approach provides feasible solutions for many problems present in economic data where least squares or maximum likelihood methods fail when naively applied. These...

The behaviour of group sequential tests in the two-sample problem is investigated if one replaces the classical non-robust estimators in the t-test statistic by modern robust estimators of location and scale. Hampel's 3-part redescending M-estimator 25A used in the Princeton study and the robust...

Several problems emerging with the studentization of M-estimators of regression model are briefly discussed and reasons for an enlargement of famous Hampel's program are given. Paper then presents a proposal of a scale-equivariant and regression-invariant scale estimator with an acceptable...