Robust estimation in the presence of influential units in surveys
David Haziza · Jan 22, 2016
Date: 2016-01-22 Time: 15:30-16:30 Location: BURN 1205 Abstract: Influential units are those which make classical estimators (e.g., the Horvitz-Thompson estimator or calibration estimators) very unstable. The problem of influential units is particularly important in business surveys, which collect economic variables, whose distribution are highly skewed (heavy right tail). In this talk, we will attempt to answer the following questions:
(1) What is an influential value in surveys? (2) How measure the influence of unit?