Not all policy questions can be addressed by social experiments. Nonexperimental evaluation methods provide an alternative to experimental designs but their results depend on untestable assumptions. This paper presents evidence on the reliability of propensity score matching (PSM), which estimates treatment effects under the assumption of…

This study attempts to evaluate Mexico's television-based secondary education system, Telesecundaria, by comparing the mathematics and language achievement of Telesecundaria students with that of students receiving traditional instruction. Student background and ability, community, teacher, and classroom variables are considered.…