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Duolingo is the world's most popular way to learn a language. It's 100% free, fun and science-based. Practice online on duolingo.com or on the apps!
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Duolingo is the world's most popular way to learn a language. It's 100% free, fun and science-based. Practice online on duolingo.com or on the apps!
Oct 14, 2021 · Caroline Fisher. October 14, 2021. Five years ago, we created the Duolingo English Test to make higher education more accessible to students around the world. This digital-first English proficiency assessment does things differently: It costs only $49, takes only 1 hour, and is the world’s first high-stakes test taken entirely online.
Combining official and self-reported data allowed Duolingo assessment scientists to correct for reporting bias via minimum discriminant information adjustment (MDIA; Haberman, 1984), a standard method for conducting this type of correction, and conduct follow-up analyses to ensure that the resulting, adjusted scores had the same properties as ...
