Evaluating preschool programs when length of exposure to the program varies: A nonparametric approach
Evaluating preschool programs when length of exposure to the program varies: A nonparametric approach
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DOI：
10.1162/003465304323023714
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发表时间：
2004-02-01
影响因子：
8
通讯作者：
Todd, PE
中科院分区：
文献类型：
--
作者：
Behrman, JR;Cheng, YM;Todd, PE
非实验数据用于评估玻利维亚学前教育计划对认知、社会心理和人体测量结果的影响。研究表明，影响很大程度上取决于年龄和暴露时间。为了最大限度地减少分布假设的影响，项目影响被估计为年龄和持续时间的非参数函数。开发了广义匹配估计器并用于控制程序和曝光持续时间的非随机选择性。与三组（不在该计划中的儿童、参与该计划少于或等于 1 个月的儿童以及生活在类似地区但未参与该计划的儿童）的比较表明，对于该计划对认知和心理社会结果的显着积极影响（接触时间大于或等于 7 个月）的估计是稳健的，尽管影响的年龄模式因对照组而略有不同。
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 nonparametric functions of age and duration. A generalized matching estimator is developed and used to control for nonrandom selectivity into the program and into exposure durations. Comparisons with three groups-children in the feeder area not in the program, children in the program for less than or equal to1 month, and children living in similar areas without the program-indicate that estimates are robust for significant positive effects of the program on cognitive and psychosocial outcomes with greater than or equal to7 months' exposure, although the age patterns of effects differ slightly by comparison group.