67 – Estimating Unauthorized Migration
Design and Analysis of Foreign Migrations Surveys via Center Sampling
Gianluca Baio
University College London
Gian Carlo Blangiardo
University of Milano-Bicocca
Marta Blangiardo
Imperial College London
We address in this paper the problem of performing a statistical survey of a group of individuals present in a certain population, when information about the complete list of the members is missing or partially unknown. This problem is particularly relevant in immigration analysis, where many of the individuals are possibly illegal migrants and therefore not formally registered or accounted for in of�cial statistics. We propose a sample method that integrates information provided by speci�c surveys and subjective knowledge available to the experimenter about the geo-social reality of interest.
