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The data come from a randomized controlled trial conducted in 9 public secondary schools in the Dominican Republic during the 2023\u20132024 school year. The study evaluated the impact of integrating computer-adaptive learning (CAL) technology into regular mathematics instruction for ninth-grade students across 38 classrooms. A second randomization assigned small-group tutoring to academically at-risk students in treated classrooms. The dataset includes student-level baseline, midline, and endline survey data, administrative records (grades, attendance, dropout), and platform usage data. Pre-registered as AEARCTR-0012383; IRB protocol 24-444 (Teachers College Columbia University)."},"version_statement":{"version":"This dataset accompanies the paper \"Improving Student Outcomes through Adaptive Learning Platforms: Experimental Evidence from the Dominican Republic\" (Lopez & Pineda). The data come from a randomized controlled trial conducted in 9 public secondary schools in the Dominican Republic during the 2023\u20132024 school year. The study evaluated the impact of integrating computer-adaptive learning (CAL) technology into regular mathematics instruction for ninth-grade students across 38 classrooms. A second randomization assigned small-group tutoring to academically at-risk students in treated classrooms. The dataset includes student-level baseline, midline, and endline survey data, administrative records (grades, attendance, dropout), and platform usage data. Pre-registered as AEARCTR-0012383; IRB protocol 24-444 (Teachers College Columbia University)."},"study_info":{"abstract":"Most students in developing countries receive grade-level instruction despite lacking prerequisite skills, widening learning gaps. To address this mismatch, we conducted a randomized controlled trial integrating computer-adaptive learning (CAL) technology into regular classroom instruction for ninth-grade students in the Dominican Republic. We replaced two of seven weekly mathematics hours with an adaptive software that adapts to individual skill levels. CAL improved test scores by 0.28-0.31 standard deviations. However, we find no evidence that adding small-group tutoring enhanced these benefits; if anything, classrooms assigned to receive both interventions showed smaller gains than those receiving CAL alone, though this difference is not statistically significant. We document implementation challenges and explore potential mechanisms, including reduced platform engagement in tutoring classrooms. These results suggest computer-adaptive learning software can be effectively integrated into classroom instruction to improve learning, but combining multiple interventions may produce unintended behavioral responses that diminish their effectiveness.","coll_dates":[{"start":"2023-09-01","end":"2023-09-30","cycle":"Baseline"},{"start":"2023-12-01","end":"2023-12-31","cycle":"Midline"},{"start":"2024-05-01","end":"2024-09-30","cycle":"Endline"}],"nation":[{"name":"Dominican Republic","abbreviation":"DOM"}],"geog_coverage":"Urban","analysis_unit":"Students","universe":"Ninth-grade students enrolled in public secondary schools in Santo Domingo and Santiago, Dominican Republic, during the 2023\u20132024 school year. Schools were selected based on having an active computer lab, reliable electricity and internet access, an extended-day format, and at least three ninth-grade classrooms. 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