“…Meta-analysis for research synthesis has been actively studied in statistics and the resulting literature is vast; see, e.g., Borenstein, Hedges, Higgins, and Rothstein (2009) for a textbook and Cooper et al (2019) for a handbook volume. In economics, existing applications of meta-analysis and meta-regression include Card and Krueger (1995), Dehejia (2003), Bandiera, Fischer, Prat, and Ytsma (2017), Card et al (2017), Meager (2019Meager ( , 2020, Imai, Rutter, andCamerer (2020), andVivalt (2020). See Stanley (2001) for a review.…”