Syndicate content

Blogs

Weekly links: preventing coups through free trade?, why don’t Indians eat more? And more…

David McKenzie's picture

Power calculations: what software should I use?

Berk Ozler's picture

In my experimental work, I almost always do cluster-randomized field experiments (CRTs – T for trials), and therefore I always used the Optimal Design software (OD for short), which is freely available and fairly easy to use with menu based dialogue boxes, graphs, etc. However, preparing some materials for a course with a couple of colleagues, I came to realize that it has some strange basic limitations. That led me to invest some time into finding out about my alternatives in Stata. I thought I’d share a couple of things I learned here.

Weekly links June 26: hurting power, banning bottled water, the case against training, and more…

David McKenzie's picture

Do More Hours Equal More Learning? Probably, But It Isn't Cheap

David Evans's picture
In many countries around the world, universal primary school enrollment has been achieved. But quality remains an ongoing challenge. How do you get students to learn more? One solution that comes up often in Latin America and the Caribbean is to increase the length of the school day. From Mais Educação in Brazil to Jornada Escolar Completa in Chile, many governments are considering or are already rolling out additional hours to the school day.

Will more hours help?

Another reason to prefer Ancova: dealing with changes in measurement between baseline and follow-up

David McKenzie's picture
A few months ago, Berk blogged about my paper on the case for more T, and in particular, on the point that Ancova estimation can deliver a lot more power than difference-in-differences when outcomes are not strongly autocorrelated.

Weekly links June 19: The anthropological argument for just giving cash, slow thinking, what those classic psych experiments really say and more…

David McKenzie's picture

Randomizing Competition: allowing CCT recipients to get more goods for their money

David McKenzie's picture
The Dominican Republic’s Solidaridad conditional cash transfer program provides its monetary transfers to poor families in the form of a debit card that can only be used at a network of grocery stores affiliated with the program (it does this in part to ensure they spend the money on food). The typical monthly transfer is about $36, which is 17% of median monthly food expenditure.

Weekly links June 5: what to read, enhancing trust in your data, what to call those skills, and more…

David McKenzie's picture

Pages