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はてなキーワード: official languageとは
The EF English Proficiency Index has been the subject of criticism in literature. From the point of view of methodology, it suffers from self-selection bias. Instead of testing the level of English proficiency in the population, it tests the level of English of those who self-select. [14] Moreover, the countries at the top of the rankings are often those whose official languages are gradually subject to 'domain loss' in favour of English, because they are being used less and less in scientific research, academic teaching and multinational corporations.[15] The selection bias is noted but not mitigated in EF's analysis.[16]
