Behrman, Jere R.; Cheng, Yingmei; Todd, Petra E. - In: The Review of Economics and Statistics 86 (2004) 1, pp. 108-132
Nonexperimental data are used to evaluate impacts of a Bolivian preschool program on cognitive, psychosocial, and anthropometric outcomes. Impacts are shown to be highly dependent on age and exposure duration. To minimize the effect of distributional assumptions, program impacts are estimated as...