https://www.nber.org/papers/w13514
The Effect of Grade Retention on High School Completion | NBER
Founded in 1920, the NBER is a private, non-profit, non-partisan organization dedicated to conducting economic research and to disseminating research findings...
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https://www.pewresearch.org/race-and-ethnicity/2012/08/20/appendix-b-high-school-completion-and-college-enrollment/
Appendix B: High School Completion and College Enrollment | Pew Research Center
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https://www.dshs.wa.gov/esa/chapter-7-education-training/73-basic-education-skills-enhancement-high-school-completion-high-school-equivalency
7.3 Basic Education, Skills Enhancement, High School Completion & High School Equivalency | DSHS
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