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RCTs

The importance of study design (why did a CCT program have no effects on schooling or HIV?)

Berk Ozler's picture

A recent paper in Lancet Global Health found that generous conditional cash transfers to female secondary school students had no effect on their school attendance, dropout rates, HIV incidence, or HSV-2 (herpes simplex virus – type 2) incidence. What happened?

Mind Your Cowpeas and Cues: Inference and External Validity in RCTs

Berk Ozler's picture

There is a minor buzz this week in Twitter and the development economics blogosphere about a paper (posted on the CSAE 2012 Conference website) that discusses a double blind experiment of providing different seeds of cowpeas to farmers in Tanzania.

It worked for you. Will it work for me?

Berk Ozler's picture

Following on David’s rant on external validity yesterday, which turned out to be quite popular, I decided to keep the thread going. Despite the fact that the debate is painted in ‘either/or’ terms, my feeling is that there are things that careful researchers/evaluators can do to improve the external validity of their studies.