Methods and Procedures:
PIRLS 2021 Technical Report
Chapter 11: Implementing the PIRLS 2021 Achievement Scaling Methodology
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Matthias von Davier, Ina V.S. Mullis, Bethany Fishbein, and Pierre Foy, Editors
Liqun Yin, Ummugul Bezirhan, Bethany Fishbein, and Pierre Foy
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