Weekly links June 5: aggregating noisy evidence, standard deviations are a terrible way of comparing effect sizes redux, services-led development, and more… David McKenzie June 05, 2026 This page in: English © 2026 The World Bank Group,

https://blogs.worldbank.org/en/impactevaluations/weekly-links-june-5--aggregating-noisy-evidence--standard-deviat VoxDev interviews Rafe Meager on aggregating evidence. “There’s just very little serious attempt to deal with noise. People do these power calculations that are mostly, to be honest, made up or kind of reverse engineered.”…” Rafe worries about ‘cookie cutter’ approaches that apply meta-analytic recipes without care – more methodological progress is required for these aggregation methods.” © 2026 The World Bank Group,