| Description |
The Index captures citizenship rights in eighteen OECD countries. The index is based on four indicators: allowance of dual citizenship; acceptance of birthright citizenship; absence of a language requirement; number of years required prior to naturalization.
The index is constructed as follows. first, authors created three categories for the residency requirement coded 0 for countries that require more than ten years, 1 for countries that require between five and ten years, and 2 for countries that require fewer than five years. Then they created an additive index as residency+2*dual citizenship+2*citizenship by birth+2*no language requirement
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