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.
Berk Ozler's blog
I attended this conference at Madison, WI last week, which was quite pleasant except the weather – it snowed!
I have been thinking about marriage recently. No, not about my own marital status, but marriage among school-age girls and its effects on future outcomes… While many arguments are made to curb teen marriages (and pregnancies), it is not clear whether these events themselves are the cause of poor future outcomes or they are simply correlated with other background characteristics that are prognostic of future outcomes. A brief survey of the literature indeed suggests that the evidence is mixed; especially when it comes to the effects of teen childbearing on future outcomes.
Update: Lant Pritchett has kindly responded to my invitation and posted his thoughts: "No need for unmet need." Check out the comments section.
As those of you who follow the blogosphere on development economics may have heard, Chris Blattman and Jeannie Annan had a healthy baby born this past Sunday. The mother and the baby are reported to be happy and healthy. We send Chris, Jeannie, and little Amara our best wishes.
You can read Chris' blog here.