CGD Policy Blogs
Over the past 10 to 15 years, randomized evaluations have gone from being a rarity to a standard part of the toolkit of academic development economics. We are now at a point where, at least for some issues, we can stand back and look beyond the results of a single evaluation to see whether certain common lessons emerge.
Here are two pictures to help you get into the holiday spirit. The World Health Organization has data on global incidence of various diseases that can be prevented by vaccination. These are numbers aggregated from country reports to the organization, which are subject to considerable error. The WHO warns that reported disease incidence data usually represent only a fraction of actual cases of the disease. Nonetheless, the data is useful to monitor trends in prevalence, and a lot of those trend
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