Did students learn less during the COVID-19 pandemic? Reading and mathematics competencies before and after the first pandemic wave

Learning loss due to school closures during the COVID-19 pandemic

(2021) Per Engzell et al.   PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA

Effects of COVID-19-Related School Closures on Student Achievement-A Systematic Review

(2021) Svenja Hammerstein et al.   Frontiers in Psychology

Compensating for academic loss: Online learning and student performance during the COVID-19 pandemic

(2021) Andrew E. Clark et al.   CHINA ECONOMIC REVIEW

The effect of school closures on standardised student test outcomes

(2021) Joana Elisa Maldonado et al.   BRITISH EDUCATIONAL RESEARCH JOURNAL

COVID-19 and educational inequality: How school closures affect low- and high-achieving students

(2021) Elisabeth Grewenig et al.   EUROPEAN ECONOMIC REVIEW

Ranking the effectiveness of worldwide COVID-19 government interventions

(2020) Nils Haug et al.   Nature Human Behaviour

The Split-Apply-Combine Strategy for Data Analysis

(2015) Hadley Wickham   Journal of Statistical Software