Recently Zografos and Nadarajah (2005) have proposed two new broad classes of measures of uncertainty based on the survival function, called the survival exponential entropy and the generalized survival exponential entropy. The survival exponential entropy preserves many of the properties of...

In this note we prove that for certain types of regression estimators with positive breakdown point, the finite sample efficiencies can be arbitrarily low when the design is unfavorable. In particular, the estimator proposed by Yohai and Zamar (1988), which is asymptotically efficient when the...