Residency testing

Ene-Margit Tiit, University of Tartu

Number of residents or population size is important for all countries and regions, especially nowadays, when population is mobile and results of censuses expire rapidly. To solve this problem, a concept of residency index was elaborated. Residency index R(i,k) is a characteristic, calculated for each year k for each person i from the set of potential residents and having the value between 0 and 1. For certain residents the index has value 1, for certain non-residents – value 0. All persons having the index higher than threshold c are considered as residents in year k. Hence, the index can be regarded as probability of being a resident.