The Norwegian historic population register and migration

This paper describes the building of a Norwegian historical population register that is under construction. It is based on linking together person entries from a large number of sources by linking algorithms and crowd sourcing. There are 9.7 million residents of Norway in the period 1735 - 1964 and 37.5 million events in most relevant sources. We want to link together as many events as possible for the same persons and families but only include links that have a high probability to be correct.
As the first open national population register, we believe that it will be particular important for migration studies. It is much easier to follow both national and international migration on a national level. Quite many of the international migration sources are national, and place of birth is specified by nationality for persons born abroad.