To measure the various components of Immigration Regime Openness (IRO), this article uses data of the Immigration Policies in Comparison project (IMPIC; Helbling et al. 2017). IMPIC covers 33 OECD countries from 1980 to 2010 (unfortunately, at this point, no data is available after 2010 and it is too resource-intensive for an individual researcher to update it). To measure Citizenship Regime Inclusiveness (CRI), I have created an original dataset that builds on the most essential elements that can be found in the Migration and Integration Policy Index (MIPEX) strand on Access to Nationality (Huddleston and Niessen 2011).
