One of the standard defenses of an RCT proposal to a skeptic is to invoke budget and implementation capacity constraints and argue that since not everyone will get the desired treatment (at least initially), the fairest way would be to randomly allocate treatment among the target population. While this is true, it is also possible to take into consideration the maximization of participants’ welfare and incorporate their preferences and expected responses to treatment into account while designing an RCT that still satisfies the aims of the researcher (identify unbiased treatment effects with sufficient precision). A recent paper by Yusuke Narita seems to make significant headway in this direction for development economists to take notice.
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?
These are some of the views and reports relevant to our readers that caught our attention this week.
Freedom on the Net 2016- Silencing the Messenger: Communication Apps Under Pressure
Internet freedom has declined for the sixth consecutive year, with more governments than ever before targeting social media and communication apps as a means of halting the rapid dissemination of information, particularly during anti-government protests. Public-facing social media platforms like Facebook and Twitter have been subject to growing censorship for several years, but in a new trend, governments increasingly target voice communication and messaging apps such as WhatsApp and Telegram. These services are able to spread information and connect users quickly and securely, making it more difficult for authorities to control the information landscape or conduct surveillance.
The limitations of randomised controlled trials
VOX/The Centre for Economic Policy Research
In recent years, the use of randomised controlled trials has spread from labour market and welfare programme evaluation to other areas of economics, and to other social sciences, perhaps most prominently in development and health economics. This column argues that some of the popularity of such trials rests on misunderstandings about what they are capable of accomplishing, and cautions against simple extrapolations from trials to other contexts.
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.
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.
I attended this conference at Madison, WI last week, which was quite pleasant except the weather – it snowed!