This paper considers the impact of Programa de Educacion, Salud y Alimentacion (PROGRESA), a large Mexican rural anti-poverty programme that had an evaluation sample in which overall treatment was randomly assigned to some communities but not others, on child nutrition. When we examine the...

The assessment of the impact of social programs is the subject of lively, sometimes heated debate over whether program evaluation is best conducted either by comparing mean outcomes from a randomized intervention or by using econometric techniques with nonrandom samples. This paper contributes...