Ponce Jarrín JE, Intriago Armijos RV. Quantifying learning losses due to COVID-19 in Ecuador: A fixed-effects analysis of standardized test scores for elementary and middle school. GAPP [Internet]. 2024 Nov. 14 [cited 2026 Nov. 7];(36):81-95. Available from: https://revistasonline.inap.es/index.php/GAPP/article/view/11346