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TIMSS & PIRLS International Study Center. (2017). PIRLS 2016 achievement scaling methodology. In M. O. Martin, I. V. S. Mullis, & M. Hooper (Eds.), Methods and Procedures in PIRLS 2016 (pp. 11.1-11.9). Retrieved from Boston College, TIMSS & PIRLS International Study Center website: https://timssandpirls.bc.edu/publications/pirls/2016-methods/chapter-11.html
Michael O. Martin, Ina V.S. Mullis, and Martin Hooper, Editors
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