DICL Language Database
International Common Language Links
The Domestic and International Common Language Database (DICL) contains bilateral measures of both international and domestic language similarity for 242 countries. The international measures reflect linguistic similarities between populations in different countries while the domestic measures reflect similarities among each country's domestic population. The measures are derived from 6,534 individual languages and reflect three aspects of language including official languages, native spoken languages, and linguistic proximity between different languages.
Gurevich, Tamara, Peter Herman, Farid Toubal, and Yoto Yotov, (2021), “One Nation, One Language? Domestic Language Diversity, Trade and Welfare”, USITC Economics Working Paper 2021-01-B. (Link to Paper)