In numerous discussions with colleagues I am struck by the varied views and confusion around whether to use sample weights in regression analysis (a confusion that I share at times). A recent working paper by Gary Solon, Steven Haider, and Jeffrey Wooldridge aims at the heart of this topic. It is short and comprehensive, and I recommend it to all practitioners confronted by this question.
· If a program is “obviously working”, does it need an impact evaluation? Markus Olapade reflects on this on the 3ie blog.
A new study presented at Conference on Retroviruses and Opportunistic Infections found that a community intervention (a package that improves take-up, provides community engagement, and post-test support)
Today I wanted to take the opportunity to talk about a new initiative that the Africa Region and the Research Group at the World Bank are launching today. The idea here is that we don't know enough about how to effectively address the underlying causes of gender inequality. Let me start by explaining what I mean by underlying causes. Take the case of female farmers. There is a lot of literature out there which shows that women have lower agricultural yields than men. And some of it shows that this is because women have lo
Many important policies are implemented at the national level. Monetary policy, fiscal policy, and many regulations are key examples. Pure time series or before-after analysis of the impacts of changes in these policies on the economy of a country will be contaminated by other changes going on in the economy. Simply trying to difference out global trends will not account for systematic differences in the growth path of the country where the reform took place from the average global growth path. This makes evaluation of the impacts of such policies difficult.
· A new From Evidence to Policy note looks at the impact of a community grant program in Indonesia which gave grants to communities for health and education services. The program lowered malnutrition, and finds performance-based incentives lead to improved performance.
Worker training and skill upgrading programs are a major focus in impact evaluation work. The design of such training programs implicitly involves the identification of the activities that a worker needs to accomplish in a job. Only then can the program offer training in the set of skills required to complete these identified tasks.
· On the FAI blog, Jonathan Morduch discusses what’s next in microfinance, in terms of how experiments can move towards allowing greater external validity.
On the World Bank’s today page today I saw the following:
This seemed really high to me, and a strange way of presenting statistics. Following the link, it directs you to this World Bank Data Viz Tumblir which has a bunch of statistics all presented in the form, if the World had only 100 people, then…